Two bombings on Saturday in a Cairo suburb killed a teenager and her mother, officials said, the latest in a wave of blasts to hit the Egyptian capital this week. Militants have stepped up attacks after the army ousted Islamist president Mohamed Morsi in July 2013 and amid a deadly *****down by authorities on his supporters. The makeshift bombs planted in a telecommunications being built in the October 6 suburb were detonated by a mobile phone signal at around 9:00 am (0700 GMT), a police investigator told AFP. Saturday's explosion comes after five makeshift bombs at four Cairo metro stations on Wednesday and a sixth at a courthouse wounded six people.