Four children under 10 have died and their parents and an eight-year-old brother are in hospital after a house fire in Melbourne’s southwest. Firefighters were called to Mantello Drive in Werribee just before 1am on Sunday, to find the roof of a property engulfed in flames. Werribee fire brigade Lieutenant Damien Molloy said when crews arrived the house was “very well alight.” “Fire had already broken through the roof and was already coming out the front door,” he told reporters on Sunday. “We were made aware of three people that had escaped the fire.” Four children were trapped inside the house, but the intensity of the blaze made it difficult for crews to find them. “With the roof already being compromised and the tiles collapsing, it was unsafe for our members to be able to proceed initially,” Molloy said. “With the distress of the parents and eight-year-old, it was difficult …