BEIRUT - Activists said pro-government militia men and security forces killed at least 78 people, including children, in Syria's central province of Hama on Wednesday.Some of those killed in the village of Mazraat al-Qabeer were stabbed to death, the activists said, and at least 12 bodies had been burned.The killings came less than two weeks after a massacre in the Syrian town of Houla, in which some 108 people were killed, nearly half of them children.