A journalist working for a pro-opposition Cambodian newspaper and his son were killed in a drive-by shooting in the capital, police said Saturday. Khem Sambo, 47, reported on corruption and other social ills under the rule of Prime Minister Hun Sen for the anti-government newspaper Moneaseka Khmer. He was riding a motorcycle with his 21-year-old son on Friday when they were each shot twice by a man who was also riding a motorcycle, Phnom Penh police Chief Yim Simony said. They died later in a hospital. "At this stage we do not have any leads yet about the motive. We are collecting evidence and witnesses who could help us in searching for the attackers," Yim Simony said.