A teenager was killed and nine persons, including a woman, were seriously injured in a crude bomb blast by suspected militants in upper Assam’s tea town of Dibrugarh on Tuesday, police said.

The crude bomb, planted under an electric pole went off at around 5 p.m. behind the old railway station in the busy Amolapatty area injuring 10 persons, some of them critically, district Superintendent of Police Rana Bhuyan told PTI.

One of the injured, 14-year-old Purnima Rojok, succumbed to her wounds at the Assam Medical College Hospital where the other injured were admitted, the sources said.

Preliminary investigations pointed to a crude bomb and not a grenade as no splinters were found at the site of the blast and also there was no trace of an improvised explosive device (IED), Mr. Bhuyan said.

The identity of the insurgent outfit responsible for the blast was not immediately known as investigations were on, the SP said.

The explosion created a two feet wide crater on the road, the sources said.

Local people had reported to police that two extremists came on a motorcycle and hurled a grenade before fleeing.

Senior police officials have rushed to the site, cordoned off the area and tightened security arrangements in the town.

On December 15, 2013 a grenade was exploded by suspected anti-talk NDFB (Songbijit) at Molandubi Market in Kokrajhar district killing one person and injuring four others.

Ms. Rojok, a resident of Amoraguri area, was studying in class VIII, her family said.

The injured were identified as Bhairon Shah (45), Dalim Shah (42), Paramnand Yadav (42), Kishor Roy (27), Bablu Das (32) and Shahnawaz Hussain (24), police sources said.

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