QALAT, Afghanistan, May 19 (Xinhua) -- At least three Afghan policemen were killed and two others wounded during an ongoing clash with Taliban militants in the Daychopan district of Zabul, the country's southern province, an official said Saturday.

"Taliban militants launched an offensive from four sides and surrounded Daychopan district since early Thursday, triggering clashes which caused three police personnel killed and two others wounded," Ata Jan Haqbayan, chairman of provincial Council, told Xinhua.

He said that the clashes were still ongoing as of Saturday morning and if the government did not dispatch reinforcing troops to Daychopan, the Taliban may overrun the district in northern of the provincial capital.

The Taliban-led insurgency has been on the rampage since the beginning of 2015 when the Afghan security forces assumed full responsibilities of security from the United States and NATO troops.

The militants also intensified attacks against security forces and staged several coordinated attacks against Afghan cities and districts after they launched a yearly rebel offensive on April 25.