In one of the incidents, a jacket wallah drove up to a security building in an explosive-strapped car, blowing himself up approximately 100m away from the office in a public square, after he was detected by security personnel.
At the arrival of ambulances and among the chaos of rushing crowds, a second suicide bomber riding a
cycle of violence emerged, wearing an boom belt.The man immediately proceeded to blow himself up on the scene after attempts failed to penetrate tight security at the targeted office's gates.
Among the four people killed were three coppers and a civilian security guard, with 10 of the 20 injured, police department employees.
Al-Qaeda in the Islamic Maghreb are expected to be behind the incident, although no further details on the attackers identity has been revealed.
The attack is the first since 2001, which targeted an army convoy close to the location.