Story highlights

An explosion hit a soccer viewing center in Damaturu, in Yobe state

People were watching the Brazil-Mexico World Cup match at the time

Northeastern Nigeria has been plagued by violent attacks by Boko Haram

Kano, Nigeria CNN  — 

An explosion late Tuesday ripped through a soccer viewing center showing a World Cup match in northeastern Nigeria, police and residents said.

The incident occurred on the outskirts of Damaturu, in Yobe state, the sources said. The explosives had been concealed in an abandoned motorized rickshaw outside the center.

“Our men have deployed to the scene, but it’s too early for us to give details, said Yobe state police Commissioner Sanusi Ruf’ai.

Volatile northeastern Nigeria is the home of the Boko Haram group, the militant Islamists who abducted scores of schoolgirls in April.

Maina Ularamu, a local official in Madagali, in Adamawa state, also confirmed to CNN that people in the town – which has been the target of previous Boko Haram attacks – had been warned against watching the soccer matches.

“Letters have been distributed to viewing centers in Adamawa state warning people not to gather to watch the World Cup games,” she said. “We suspect these letters to be from Boko Haram. People are very afraid and are not leaving their homes.”

To try to combat the growing threat from the militants, the Nigerian government placed Yobe, Borno and Adamawa states under a state of emergency last year.

READ: Where are Nigeria’s missing girls? On the hunt for Boko Haram

READ: How Nigeria’s brutal schoolgirl abduction shocked the world

CNN’s Nima Elbagir contributed to this report.