At least five people have been killed in a bomb attack on a police convoy in Jalingo, capital of Taraba State, police say.

"A bomber on a motorcycle rammed into the police rider [motorcycle escort]," a police spokesman said.

The attack in the normally quiet town of Jalingo comes a day after at least 20 people were killed at churches in Kano and Maiduguri, reports the BBC.

No group has said it carried out the bombings but militant group Boko Haram has staged many such attacks.

It has carried out several suicide bombings across the northern part of the country, where it wants to establish Sharia law.

Some reports say Taraba State Police Commissioner, Mamman Sule was targeted in the Jalingo attack.

Witnesses say Sule survived the attack but that the huge explosion ripped through a nearby market and the local finance ministry offices, the AP news agency reports.

Meanwhile, there was pandemonium in Yola Monday after people scampered for their lives following a bomb scare in the Adamawa State capital.

The incident happened at about 8.30 am when a Honda Accord car was noticed parked in an area adjacent to the state police headquarters.

The car attracted the attention of a patrol team of the joint internal security outfit, who immediately condoned off the area diverting both vehicular and human traffic away from the busy route for over three hours.

It was the sight of the patrol team at the site of the Honda car that prompted people around the scene to flee for their lives fearing a possible explosion.

Confirming the incident, Police spokesman, ASP Nemuel Yoila,however, said nothing dangerous was found when the bomb disposal squad arrived.

"They (bomb disposal squad) only discovered that it was an empty car parked by the roadside."

With Agency Reports