Cambodia journalist shot dead - police

PHNOM PENH, July 11 (Reuters) - A Cambodian journalist working for an opposition newspaper was shot dead on Friday by unknown gunmen who fired on the victim and his son, police said.

Khim Sam Bo, 47, was shot twice and his 19-year-old son was seriously wounded in the capital Phnom Penh, as they left a sports stadium, police chief G. Touch Naruth said.

"We do not know the motive for the killing yet. The investigation continues," he told Reuters.

Colleagues said he had written stories criticising senior government officials and corruption in the government of Prime Minister Hun Sen, who is seeking re-election in a July 27 general election.

Khim Sam Bo worked for more than 10 years for the Khmer Conscience newspaper, whose editor Dam Seth was recently accused of defaming Foreign Minister Hor Namhong. The charges were later dropped.

"I am so disappointed. It hurts me to hear that he was killed," Dam Seth told Reuters.

"I call on the authorities to find the killers of Khim Sam Bo and punish them," he said. (Reporting by Ek Madra; Editing by Darren Schuettler and Bate Felix)