Gamboru, a town in Borno State bordering Cameroun, where over 300 people were killed in multiple attacks on Monday, has been cut off from the country as Boko Haram insurgents Thursday blew the bridge linking the rest of the state.

Survivors of the most recent attack on the town are now estranged from their relations living in other parts of the state and are forced to take refuge in Cameroun.

A source said the only option left for people traveling to and from Gamboru is to go into Banki near Bama local government area of Borno into Cameroon and later enter Gamboru from another village in the neighbouring country.

So far, 315 corpses from Monday’s attack have been buried in mass graves.

A resident told journalists on the phone that dozens of people have been buried in mass graves on Wednesday and Thursday with up to ten bodies in each grave.

Residents believe that more persons are still trapped in the debris as 50 more bodies were recovered on Wednesday.