Dozens dead after bombing at market

A bomb blast killed at least 50 people in northeastern Nigeria and hundreds of fighters invaded a town across the border in Cameroon in attacks on Tuesday that witnesses and officials blame on Boko Haram Islamic extremists.

In recent weeks, a string of bombings and village raids have killed hundreds as officials promise the deployment of a regional army to halt the Nigerian-born Islamic uprising that has killed some 20,000 in six years and spilled across the West African nation's borders.

"So far, 52 people are injured; 47 dead persons have been removed from the market," said Umar Kidda, a member of a civilian vigilante group.