Facebook has apologised after its Safety Check system wrongly asked people if they were caught in a bomb attack in Pakistan.

The suicide attack on Sunday in a Lahore park killed more than 70 people, including children.

Facebook's Safety Check system activates after a tragedy to help people let others know they are safe.

The social network blamed a "bug" for the warnings sent to people thousands of miles away from Pakistan.

Responsibility for the attack on Sunday has been claimed by a Taliban splinter group called Jamaat-ul-Ahrar, which said it targeted Christians celebrating Easter.

Police are still looking in to the claim.