KABUL:One suicide bomber on Friday blew himself up killing 20 recruits at the police academy in Kabul. This was the second attack within 24 hours in the Afgan capital. The attack came at the time the cadets were returning from their two-days weekend break. The incident has created a serious concern in breach of security at such a premier training institute for Afgan security forces. According to a source,the bomber in a police unform found his way near a group of officers before setting off his explosives. Kabul Deputy Police Chief,Gul Agha Rouhani confirmed the incident but did not talk about casualities.