Aug 4 (Reuters) - Following are security developments in Afghanistan reported until 1200 GMT on Monday:

* denotes new or updated items.

HELMAND - Afghan and NATO forces killed 17 Taliban insurgents in a joint operation which finished on Sunday in southern Helmand province, the defence ministry said on Monday, adding two Afghan soldiers were wounded.

* URUZGAN - Eleven insurgents were killed in a series of clashes with police on Sunday in Uruzgan, the interior ministry said on Monday. Five police were wounded in the clashes, it added.

PAKTIKA - An explosion at a mosque killed the imam and another man on Monday in southeastern Paktika, a provincial official said. The cause of the blast was being investigated.

MAIDAN WARDAK - Insurgents killed an army officer and wounded two more in an ambush in Maidan Wardak, west of Kabul, the defence ministry.

GHAZNI - Taliban insurgents killed a district police chief and four other policemen and wounded seven in an attack in Zana Khan, Ghazni province, on Sunday, a security officer in the province said. A group of men also complained to the governor about what it said was the killing of five civilians and arrest of three others in a raid by foreign forces in another area of Ghazni overnight. The U.S. military said troops under its command carried out the operation and killed "several militants".

NANGARHAR - Foreign troops in a convoy fired at a vehicle carrying civilians, wounding two, in the eastern province of Nangarharm on Monday, a provincial official said.

SPIN BOLDAK - Two militants were killed while planting a roadside bomb in an area of Spin Boldak, which lies near the border with Pakistan, on Monday, police said.

BAGHLAN - U.S.-led coalition forces killed several militants and detained one during an operation in the Tala Wa Barf district of the northern Baghlan province on Sunday, a U.S. military statement said.

PAKTIA - Taliban rebels killed three Afghan police officers and seized their vehicle in the eastern province of Paktia on Sunday, a provincial spokesman said on Monday.

* Reuters could not establish contact with the Taliban to seek their reaction.

(Compiled by Hamid Shalizi; Editing by Sayed Salahuddin and David Fox)