RAF planes have dropped a second round of humanitarian aid to Yazidi refugees trapped on Mount Sinjar in northern Iraq. The drop, which included water containers, took place on Monday night, the Department for International Development has said. RAF Tornado jets will also be sent to the troubled region which has been overrun by Islamic State militants. The jets will possibly be used in reconnaissance missions to help aid operations and are expected to leave Britain in the next 48 hours. A first aid drop by RAF planes took place on Saturday, with 1,200 water containers and 240 solar lanterns delivered to the refugees. International Development Secretary Justine Greening said: "The humanitarian situation in Iraq area is deeply worrying. Isis terrorists continue to contest towns and villages south of Erbil and in the Sinjar area and the Yazidi community face appalling conditions, cut off on Mount Sinjar. "UK aid is already helping the people who desperately need it. Last night the RAF successfully made a second drop of essential supplies, including 3,180 reusable containers filled with clean water." Despite calls from some Conservative MPs, including MP for Bournemouth West Conor Burns, for Prime Minister David Cameron to recall Parliament to discuss the crisis that has seen Iraqi Christians and other minorities slaughtered by Islamic State fighters, Downing Street has said a "recall is not on the cards".