Authorities said, part of a series of attacks that saw two US troops killed and a top Afghan court official gunned down.

Security in the capital, Kabul, has been stepped up as the Taliban have warned that attacks will continue as most foreign troops prepare to withdraw at the end of the

month, 13 years after the September 11 terror attacks sparked the US-led invasion.

The attack targeting the mine-clearing operation struck southern Helmand province between its Nadali and Washir districts, police spokesman Farid Ahmad Obaid said.

He said Taliban militants killed at least 12 workers and wounded another 12. Afghan soldiers later began a firefight with the insurgents, he said.

Obaid identified the company working on the project as Star Link.
Afghanistan, which has suffered decades of continuous war, is one of the most heavily mined countries in the world. Those working on projects to clear mines often find

themselves targeted by the Taliban and other insurgents in the country.

In April, Taliban fighters killed 12 people working on a mine-clearing project in Logar province.
Late on Friday, a militant attack on a military convoy killed two US soldiers by the Bagram air base in Parwan province near Kabul, an international military official told.

The official spoke on condition of anonymity as the information wasn't authorized for release. NATO's International Security Assistance Force said in a statement that

two service members "died as a result of an enemy forces attack in eastern Afghanistan."
NATO does not identify the nationalities of the dead, relying instead on their home countries.

The deaths on Saturday were the first foreign troops killed this month, bringing to 65 the total number of international troops killed in the country this year, 50 of them Americans.

Early on Saturday gunmen shot dead Atiqullah Rawoofi, the head of the court's secretariat in Kabul's northwestern suburbs, said Farid Afzali, chief of the Kabul police criminal investigation unit.

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