Egypt's Interior Ministry says it has killed six militants believed to be involved in a weekend bombing in the coastal city of Alexandria that killed two policemen.The statement late on Sunday said the militants belonged to the Hasm movement and were killed in a raid on their hideout in Beheira province.The Alexandria blast occurred when an explosive device that was placed under a car detonated as the city's security chief's convoy was driving by on Saturday. He was unharmed.No group has claimed responsibility for the attack.The bombing came just ahead of Egypt's presidential election tha got underway on Monday. President Abdel-Fattah al-Sisi faces no serious challenge in the vote.Authorities consider Hasm, which routinely targets security personnel, to be a splinter group of the outlawed Muslim Brotherhood group. Militant attacks have surged in Egypt since the military's 2013 ouster of an elected Islamist president, Mohammed Morsi. KEEP UPDATED on the latest news from around the continent by subscribing to our FREE newsletter, Hello Africa.FOLLOW News24 Africa on Twitter and Facebook.