Afghans children eat free food donated by other villagers as they break their fast during the second week in the holy month of Ramadan in Kabul, Afghanistan, Wednesday, July 17, 2013. Ramadan is the holiest month in Islam and observant Muslims worldwide observe it by fasting from dawn to dusk. KABUL, Afghanistan (AP) - Insurgents pulled over a minivan with eight young laborers on their way to work at a U.S. base in eastern Afghanistan on Thursday, forced them out and then shot them dead, officials said. The killings near Forward Operating Base Shank, a U.S. base in Logar province, were the latest in a militant campaign of intimidation against Afghans working for the government or the international coalition. The attack took place just after dawn near Puli Alam, the provincial capital. They were eight ordinary laborers going to work at that base. They were day laborers," said Logar deputy police chief Raeis Khan Abdul Rahimzai. This is very hard to believe. It is an inhuman and un-Muslim act against innocent people. He said the eight were heading for temporary day jobs at the base and were not part of the facility's local staff. The gunmen let the driver of the minivan go and did not harm him, Rahimzai said. Provincial spokesman Din Mohammad Darwesh said there were four gunmen on motorcycles who pulled over the minivan. They just took them out of the car and shot them. They are all in their late teens and early 20's," Darwish said. Both officials said it was unclear if the incident could have been in reprisal for a coalition airstrike that killed 18 Taliban fighters in another part of the province on Wednesday. Logar, located just south of Kabul, has seen a sharp increase in insurgent activity this year, The Afghan army last week carried out a large operation against insurgents operating in the province. The Taliban have said they will not stop fighting during the holy month of Ramadan, which began last week, and will instead step up their attacks. About 1,000 Afghan civilians have been killed and more than 2,000 wounded in the first half of the year, according to the United Nations. That marked a 24 percent increase in casualties compared to the same period last year. As the NATO-led coalition last year started a withdrawal that will see most foreign troops gone by the end of 2014, the Taliban and other groups have unleashed a wave of bombings and assassinations around the country, testing the ability of Afghan security forces to respond with reduced help from NATO troops. The Taliban have said they would go after government workers and anyone working for the U.S-led coalition as part of their campaign against President Hamid Karzai's administration. The Taliban have in the past killed people working at the Logar base. Last November, militants shot and killed two translators as they were heading to work on the base. Last month, a Taliban suicide bomber struck outside of Afghanistan's Supreme Court, killing 17 people in the deadliest attack in Kabul in over a year and a half. In April, insurgents assaulted a courthouse and government offices in western Farah province, killing 46 people, including two judges, six prosecutors, administration officers and cleaners working at the site. Also in June, the U.N. special representative to Afghanistan, Jan Kubis, said insurgents were behind 74 percent of all civilians casualties in the first six months of 2013, and attributed the rise on the militants' "continuing disregard" for international laws on civilians in conflict. Kubis also said that targeting government officials and civilians was a crime under international law. The Taliban have argued that government officials and workers are legitimate targets. Associated Press writer Patrick Quinn contributed to this report from Kabul.