Eight suicide bombers attacked police headquarters in eastern Afghanistan today, killing five officers and wounding four.
Nangarhar provincial police chief Mohammad Sharif Amin said one militant in a bomb-laden car detonated his vehicle in front of the Jalalabad Police Quick Reaction Force.
His spokesman said another seven wearing bomb vests then attacked the compound, three blowing themselves up inside. Another four were shot by police during a gunfight that lasted for more than an hour.
Mr Amin said some of the attackers were wearing uniforms resembling those worn by the US-led Nato coalition.
Taliban spokesman Zabiullah Mujahid said the group carried out the attack, which happened on the second day of a visit to Kabul by US secretary of state John Kerry.
Jalalabad is the capital of Nangarhar province, about 75 miles east of Kabul.
Insurgents have in recent months been carrying out complex attacks involving car bombs and gunmen in bomb vests against government and police buildings around the country.
The attacks are expected to intensify as the traditional spring fighting season gets under way. Heavy snow and bad weather conditions usually put a damper on fighting during the harsh Afghan winter.
On March 14, the Afghan intelligence service seized a massive truck bomb packed with eight tons of explosives on the eastern outskirts of Kabul. They also killed five suspected suicide bombers and arrested two others during a raid to seize the truck.
The truck was apparently meant to carry out an attack on a Nato facility in the capital. According to Afghan intelligence, the truck bomb bore the hallmarks of the Haqqani network, known for conducting spectacular attacks. Affiliated with the Taliban, the network is run by the Haqqani family and is based across the border in Pakistan.