Primary school children boycotted class in Langtang township near Guangdong's Yunfu city on Wednesday, joining a continuing protest by thousands of residents over plans to build a waste incinerator plant near their homes...tensions remained high in Langtang after the government failed to release protesters detained in Monday's clashes, as promised...Local authorities issued a statement late on Tuesday pledging to shelve the planned incinerator, and calling on local residents not to "take extreme action"...According to local people, dozens of people were injured and detained in clashes between police and protesters on Monday, after riot police used batons to attack the crowd, including children...Residents who live within a 2- to 3-kilometer (1.2- to 1.9-mile) radius of the plant, say they fear toxic pollution if the garbage incinerator is built there...