A bomb explosion at a luxury hotel in the Pakistani city of Quetta has killed at least four people and wounded 12, writes BBC.

The Chinese ambassador to Pakistan is suspected to have been the target of the attack in the car park of the Serena Hotel, correspondents say.

He is understood to be in Quetta, the capital of Balochistan province near the Afghan border, but was not present.

Balochistan is home to several armed groups, including Islamist extremists and separatists.

The separatists want independence from the rest of Pakistan and oppose major Chinese infrastructure projects in the area.