JALALABAD - One person was killed and four others injured on Saturday when a roadside bomb went off in Jalalabad city, the provincial capital of Nangarhar province 120 km east of capital Kabul, spokesman Ahmad Zia Abdulzai for provincial government said.

A policeman keeps watch at the site of an explosion in Jalalabad August 20, 2011.[Photo/Agencies]

"A bomb was placed along a road in fifth precinct of Jalalabad city and was detonated at around 06:30 a.m. local time.

As a result one person was killed and four others injured," Abdulzai told Xinhua.

Without giving more details, Abdulzai said the man who was killed and two injured people were security personnel and two more civilians were also injured in the attack.

However, a witness who declined to be named told Xinhua near the site of the blast that some explosive was planted in a tricycle vehicle and was detonated when a car belonging to provincial intelligence agency was passing by.

No group is responsible for the attack so far, but Taliban suspects normally claim responsibility for such attacks.

The Taliban-led insurgency has been rampant since the militant group announced to launch spring offensive from May 1 against Afghan and NATO-led troops stationed in Afghanistan.