Image copyright CENAPRED Image caption The ash plume shot into the sky at 03:10 local time (08:10 GMT)

One of Mexico's most active volcanoes has sent a huge ash plume into the sky, the country's centre of disaster monitoring has reported.

Overnight video taken by the centre shows ash and incandescent material shooting from the Popocatépetl volcano 2,000m (6,500ft) into the air.

People have been warned to avoid the area inside the 12km security radius surrounding its crater.

Ash has been falling on communities near the volcano.

Carlos Valdés, the director-general of the monitoring centre, Cenapred, posted footage of the eruption on his Twitter account.

He wrote that incandescent material had been thrown 400m down the slopes of Popocatépetl.

Popocatépetl is an active stratovolcano, 70km (43 miles) south-east of the capital, Mexico City.

Its name means "smokey mountain" in the indigenous Náhuatl language.</s>What is China's Belt and Road Initiative? The project is often described as a 21st century silk road, made up of a of overland corridors and a maritime of shipping lanes. China is carrying out or planning construction projects in along these routes.

Beijing’s multibillion dollar Belt and Road Initiative (BRI) has been called a Chinese Marshall Plan, a state-backed campaign for global dominance, a stimulus package for a slowing economy, and a massive marketing campaign for something that was already happening – Chinese investment around the world.

Over the five years since President Xi Jinping announced his grand plan to connect Asia, Africa and Europe, the initiative has morphed into a broad catchphrase to describe almost all aspects of Chinese engagement abroad.

Belt and Road, or yi dai yi lu, is a “21st century silk road,” confusingly made up of a “belt” of overland corridors and a maritime “road” of shipping lanes.

From South-east Asia to Eastern Europe and Africa, Belt and Road includes 71 countries that account for half the world’s population and a quarter of global GDP.

Everything from a Trump-affiliated theme park in Indonesia to a jazz camp in Chongqing have been branded Belt and Road. Countries from Panama to Madagascar, South Africa to New Zealand, have officially pledged support.

How much money is being spent?

The Belt and Road Initiative is expected to cost more than $1tn (£760bn), although there are differing estimates as to how much money has been spent to date. According to one analysis, China has invested more than $210bn, the majority in Asia.

But China’s efforts abroad don’t stop there. Belt and Road also means that Chinese firms are engaging in construction work across the globe on an unparalleled scale.

To date, Chinese companies have secured more than $340bn in construction contracts along the Belt and Road.

However, China’s dominance in the construction sector comes at the expense of local contractors in partner countries.

The vast sums raked in by Chinese firms are at odds with the official rhetoric that Belt and Road is open to global participation and suggest that the initiative is also motivated by factors other than trade, such as China’s need to combat excess capacity at home.

What are the risks for countries involved?

More recently, governments from Malaysia to Pakistan are starting to rethink the costs of these projects. Sri Lanka, where the government leased a port to a Chinese company for 99 years after struggling to make repayments, is a cautionary tale.

Earlier this year, the Center for Global Development found eight more Belt and Road countries at serious risk of not being able to repay their loans.

The affected nations – Djibouti, Kyrgyzstan, Laos, the Maldives, Mongolia, Montenegro, Pakistan and Tajikistan – are among the poorest in their respective regions and will owe more than half of all their foreign debt to China.

Critics worry China could use “debt-trap diplomacy” to extract strategic concessions – such as over territorial disputes in the South China Sea or silence on human rights violations. In 2011, China wrote off an undisclosed debt owed by Tajikistan in exchange for 1,158 sq km (447 sq miles) of disputed territory.

“There are some extreme cases where China lends into very high risk environments, and it would seem that the motivation is something different. In these situations the leverage China has as lender is used for purposes unrelated to the original loan,” said Scott Morris, one of the authors of the Washington Centre for Global Development report.

Why is the initiative sparking global concern?

As Belt and Road expands in scope so do concerns it is a form of economic imperialism that gives China too much leverage over other countries, often those that are smaller and poorer.

Jane Golley, an associate professor at Australian National University, describes it as an attempt to win friends and influence people. “They’ve presented this very grand initiative which has frightened people,” says Golley. “Rather than using their economic power to make friends, they’ve drummed up more fear that it will be about influence.”

According to Shan Wenhua, a professor at Jiaotong University in Xi’an, Xi’s signature foreign policy is “the first major attempt by the Chinese government to take a proactive approach toward international cooperation … to take responsibility.”

Some worry expanded Chinese commercial presence around the world will eventually lead to expanded military presence. Last year, China established its first overseas military base in Djibouti. Analysts say almost all the ports and other transport infrastructure being built can be dual-use for commercial and military purposes.

“If it can carry goods, it can carry troops,” says Jonathan Hillman, director of the Reconnecting Asia project at CSIS.

Others worry China will export its political model. Herbert Wiesner, general secretary of Germany’s PEN Center, says human rights are being “left in the ditches by the sides of the New Silk Road”.

Where does it end?

Belt and Road is likely to continue, not least because these projects signal loyalty to Xi. The initiative has been enshrined in the Chinese communist party’s constitution, which also eliminated term limits, leaving Xi room to continue Belt and Road for as long as he wants.

It also gives disparate Chinese projects overseas the veneer of being part of a grand strategic plan, according to Winslow Robertson, a specialist in China-Africa relations. It is not a centralised initiative, so much as a brand, he says.

“Who determines what is a Belt and Road project or a Belt and Road country? Nobody is sure. Everything and nothing is Belt and Road.”

Not all of the most ambitious Belt and Road projects are about hard infrastructure. China plans to set up international courts, in Shenzhen and Xi’an, the former hub of the original Silk Road, to resolve commercial disputes related to Belt and Road.

“It’s a reminder BRI is about more than roads, railways, and other hard infrastructure,” said Jonathan Hillman, director of the Reconnecting Asia project at the Center for Strategic and International Studies in Washington. “It’s also a vehicle for China to write new rules, establish institutions that reflect Chinese interests, and reshape ‘soft’ infrastructure.”

Officials have said the courts, to be based on the judiciary, arbitration and mediation agencies of China’s Supreme People’s Court in Beijing, will follow international rules and will invite legal experts from outside China to participate.

Legal experts say the courts will likely be modelled on International Finance Centre Courts in Dubai and the International Commercial Court in Singapore, which has already struck an agreement with China to resolve Belt and Road-related disputes.

But critics of the independence of the country’s judicial system, which traditionally answers to China’s ruling communist party, worry the courts will favour Chinese parties over foreign firms.
Popocatépetl, a stratovolcano that is part of the trans-Mexican volcanic belt, releases a large quantity of ash.