Seven people were reported missing after their boat sank off the coast of south China's Guangdong province, local rescue services said Saturday.A maritime safety agency in Zhanjiang city is trying to find the missing crew, who went missing Friday evening, reported Xinhua. Rescue teams comprising of ships and aircraft have been searching for the missing crew. But no one has been found yet.A gale blowing over the waters where the boat sank is making it more difficult to find the seven people, the safety agency said.