Grenade wounds Thai demonstrators

A grenade blast has wounded eight anti-government protesters camped outside the Thai prime minister's office in Bangkok, emergency services say.

Demonstrators from the People's Alliance for Democracy (PAD) group have occupied the area since August.

The attack comes two days after another grenade attack on the protesters killed one person and injured more than 20.

The PAD wants the government to resign, saying it is too close to ousted former PM Thaksin Shinawatra.

The grenade exploded just after 0200 on Saturday (1900 GMT on Friday), and hit a checkpoint staffed by volunteer guards from the PAD, police said.

The protesters have been targeted by small bomb attacks in recent weeks