Karachi attack 'embarassing for Pakistan'

Gunmen have attacked a military base in the Pakistani city of Karachi, killing at least 11 soldiers, officials say.

The well-armed attackers set off explosives and have been fighting gunbattles with navy personnel at the Mehran naval aviation base.

The gunmen are now holding hostages, including Chinese military personnel.

Shahzeb Jillani, who is South Asia Editor at the BBC's World Service, says this attack will be deeply embarrassing for Pakistan.