ONLY two days after a gas main was damaged in northwest New Territories, another pipe was broken by a roadworks contractor in Shamshuipo yesterday. A 180-millimetre diameter section along Tonkin Street was damaged at 1.40 pm when workers attempted to dig holes to lay sewage pipes. A bulldozer pierced the gas tube, causing minor leakage. Gas supplies along the section were immediately shut down. They resumed four hours later.