July 14, 2012 -- Updated 0836 GMT (1636 HKT) NEW: Blast also kills the provincial head of the Afghan intelligence service NEW: "We suspect it is the Taliban who are enemies of Afghanistan," a police official says At least 40 others are injured Kabul, Afghanistan (CNN) -- A lone suicide bomber detonated a vest filled with explosives at a wedding in northern Afghanistan on Saturday, killing 22 guests, including a top politician, authorities said. Ahmad Khan Samangani, who was a member of the Afghan parliament, was killed as he hosted his daughter's wedding, Ahmadzai said. Samangani also served as a militia leader during the Afghan civil war and fought against the Taliban. The attacker's blast tore through the wedding hall in Aybak, capital of Samangan province. It seemed to target Samangani as he welcomed guests at the entrance to the hall, police said. The provincial head of the Afghan intelligence service was also killed at the wedding attended by prominent security and military officials from the area. Samangani was elected to parliament during the troubled 2010 parliamentary poll. Electoral officials at first ruled he had been unsuccessful, but his supporters blocked roads through the province in protest. He was eventually awarded a seat in Afghanistan's lower house on appeal. A number of top security officials have been assassinated in northern Afghanistan in the past 18 months.