Afghan national security forces have killed nine Taliban militants and injured ten others during a cleanup operation in the eastern province of Ghazni.Provincial Army Spokesman, Nazifullah Sultani, said on Tuesday that Afghan National Security Forces (ANSF) have conducted the operation in the Dehyak district -- situated 30 kilometers (18 miles) east of the city of Ghazni -- late on Monday. He added that the gun battle lasted for several hours, leaving nine Taliban militants dead and ten others wounded. Sultani, however, did not mention whether there were any casualties on the side of Afghan forces. The Taliban have not yet confirmed any casualties and made no comments on the operation. The United States and its allies invaded Afghanistan as part of Washington’s so-called war on terror. The offensive removed the Taliban from power, but the country is still gripped by insecurity. In late April, the Taliban announced the start of their annual “offensive” against US-led and Afghan forces, vowing a new wave of attacks across Afghanistan. The militant group said it would use "every possible tactic" to inflict casualties on Afghan and US-led forces. They specifically mentioned insider and bomb attacks. The announcement prompted Afghan authorities to beef up security in major cities across the country, including the capital city of Kabul.