Boko Haram attacks Nigerian city of Gombe

Boko Haram Islamist militants have attacked the north-east Nigerian city of Gombe.

Fighters overran a checkpoint on the edge of the city and explosions and gunfire were heard.

This assault comes a day after the militants attacked Chad, which borders Nigeria, for the first time.

The BBC's Abdullahi Kaura Abubakar has the latest.