Late Sunday night, a US-led coalition attempting to enter Pakistan had warning shots fired upon their helicopters after which after which they retreated. The incident occurred on the Afghanistan side of the border and claimed no casualties.
A security official has said the shot were fired from Pakistani troops, however this contradicts a source in the Pakistan army which has confirmed the event, but denied any involvement by the Pakistani army.
This comes as US drones have been repeatedly firing missiles into Pakistan killing dozens.
Pakistan on Sunday announced that they would defend themselves against violations of its airspace by US troops stationed in Afghanistan.