a number of civilian casualties and endangered civil aviation.”

Singapore also condemned the attack on the two oil tankers in the Gulf. One of the ships, the Japanese-owned Kokuka Courageous, had been en route to Singapore with a cargo of methanol, according to Iranian state news agency IRNA.



READ: Strait of Hormuz - The world's most important oil artery

“We also condemn the attack on commercial vessels in the Gulf of Oman on 13 June 2019,” said MFA. “It is imperative that sea lines of communication remain open, secure and free for navigation, in accordance with international law," added MFA.

The attack on the oil tankers comes a month after a similar incident in the vital sea lane. The United States has blamed Iran for the attacks, charges which Tehran has denied.

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The current conflict in Yemen dates back to 2015 when a Saudi-led alliance intervened to try to restore the internationally recognised government that was ousted from power in the capital, Sanaa, by the Houthis in late 2014.

The conflict is widely seen in the region as a proxy war between Saudi Arabia and its rival Iran, although the Houthis deny being puppets of Iran and say their revolution is against corruption.

Meanwhile, tensions between Iran and the United States have risen since May last year, when US President Donald Trump pulled out of a 2015 nuclear deal between Iran and major powers that aimed to curb Tehran’s