Gurugram, June 5 -- At least three workers resting inside a makeshift shelter of a shipping container died and one was critically injured after a gantry crane collapsed on it near Panhera Khurd in Faridabad on Thursday, police said. Police said that one of the workers was rescued after cutting the crushed container box while few others are still feared trapped. Officials said that the crane was being used to lift concrete blocks and spans for constructing a flyover which is part of a greenfield connectivity route from south Delhi, Gurugram and Faridabad to Jewar International Airport. The construction work was undertaken by the National Highways Authority of India (NHAI) Investigators said the incident took place between 1.30pm and 2pm. Police received information by 3pm, and rescue workers were rushed to the spot. Officials said that it had rained heavily in the area, following which the ground had become muddy. The crane operation was restarted after the rain stopped; however, it lost balance and collapsed. "We were able to hear the scream of only one worker, who was rescued soon after the accident. No other noise was heard," a senior police officer said. The works have not been identified by the authorities. Yashpal Yadav, public relations officer for Faridabad police, said it was unclear how many workers were trapped. "According to initial reports, at least five to six workers were resting inside the box. Rescue workers were able to pull out three bodies by 10pm," he said. "Things will be clear only after the crane, which weighs several tons, is lifted and the box is cut open. The rescued worker's legs were crushed, and he is undergoing treatment at a private hospital," he said, adding that efforts to rescue others are still ongoing. When asked about the accident, an NHAI official, requesting anonymity said that the reason for the collapse will be known after investigation....