(ANSA-AFP) - ATHENS, 25 FEB - Riot police were dispatched to the Greek islands of Lesbos and Chios on Tuesday as the government ploughed ahead with the construction of controversial new migrant camps, officials said. At the harbours of both islands, where hundreds of local residents had gathered, police used tear gas to clear the way for security force reinforcements and construction machinery, a police source told AFP. At Chios harbour on Mesta, some hooded protesters threw stones as scores of riot police disembarked, TV footage showed. Residents have parked cars and garbage trucks on roads leading to the camp sites, which are to house up to 7,000 people each, in an attempt to hobble their construction. "There are roadblocks. We will intervene where necessary," a police source told AFP. After weeks of fruitless talks with local authorities, Prime Minister Kyriakos Mitsotakis over the weekend insisted that the plan would go ahead despite opposition. "The works will begin immediately and will be completed. There is no turning back," he told conservative party cadres on Sunday. (ANSA-AFP).