Afghanistan's Taliban has claimed responsibility for an attack on the police academy in Kabul, Sky News Arabia reported.

A suicide attacker has struck near the Kabul police academy, killing at least 20 cadets and wounding 27 others, officials said, in the second major attack in the Afghan capital in 24 hours.

The bomber managed to place himself in a queue as police trainees were waiting to be searched before entering the academy, a senior intelligence official said.