Delhi Police
The Delhi Police on Thursday busted an inter-state kidney racket, which was involved in illegal kidney trade across five states of India. [Representational Image] The Delhi police put a school in the capital on lock-down following a threat call on Thursday, 4 February 2016.Reuters File

A British school in Delhi was on lockdown for at least an hour on Thursday after a threat call warned of an attack with an AK-47. 

The school received the threat call at 1 pm on Thursday, according to ANI news agency. The caller reportedly threatened to shoot students with an AK-47. 

The Delhi police put the school on a lockdown following the threat. 

Bomb threats have shut schools across the globe in recent days, including in the United States, France and recently in Australia. 

The calls have turned out to be hoaxes, and are believed to have been made by hackers or mischief-mongers. There has been no link to any terror group in connection with the threat calls to schools. 

In recent weeks, threat calls have also affected several flights in India, both domestic and international. 

Several flights have been grounded after anonymous callers warned of bombs or weapons on board.