Following intelligence inputs and threats, provincial authorities have declared a high alert in Lahore fearing more terror strikes.

According to sources, intelligence agencies have warned concerned authorities that extremists are on the look for carrying out more attacks similar to last Friday's brazen terror siege of the two Ahmedi mosques in the city.

Intelligence reports had declared Friday and Sunday as most sensitive days.

Lahore police detained 85 people in raids conducted here in the capital of Pakistan's Punjab province, following a terror alert that militants could carry out attacks during Friday prayers, police said.

Police set up check posts at Lahore's entry and exit points and conducted strict checks of vehicles, a police officer, Chaudhry Shafiq, was quoted as saying by Xinhua.

Over 70 people were killed and at least 100 injured in attacks May 28 on two places of worship of a minority group.