At least seven civilians, including one child, were killed in a bombing by unidentified military warplanes on a market in the Syrian town of Khan Sheikhoun in the north, said a British war monitor on Monday.The Syrian Observatory for Human Rights (SOHR) reported that the bombing took place in the same town which was the target of a chemical attack earlier this month, reported Efe news. At least 89 persons were killed in the April 4 attack.According to SOHR, Monday's bombing wounded several people, some seriously, and it did not rule out an increase in the toll.