Syrian state TV says a suspected suicide bomber has killed at least 25 people in the capital, in an attack that was apparently targetting a police bus. The attacker detonated his explosives in central Damascus on Friday, killing and wounding dozens of people, Syrian state TV reports. The target of the attack appeared to be a bus carrying policemen - that's according to a Syrian official. Syrian TV showed the damaged bus that had bloodstained seats, and riot police helmets and shields scattered around. The government's blaming terrorists for the assault. The attack comes after Syria's opposition rounded on the Arab League observer mission on the violence in the country, urging the UN to approve a Libya-style no-fly zone.