The announcement doesn't say who provided the intelligence or when the raids occurred. - File photo

ISLAMABAD: Pakistan's army says security forces acting on a tip have destroyed two militant bomb-making factories. But it says intelligence received about two other factories was incorrect.

The announcement doesn't say who provided the intelligence or when the raids occurred, but the Pakistani army has been trying to shake off reports that elements in its security establishment may have tipped off insurgents at suspected sites along the Afghan border after receiving information from the US.

The media accounts have further strained Pakistan-US relations in the wake of the American raid that killed Osama bin Laden.

The Pakistani army again denied any alleged collusion with militants in Friday's carefully worded statement.