Karachi Terror Attack: People light candles to protest and show solidarity

Ambulances carry bodies of Wednesday's bus attack victims for burial in Karachi, Pakistan, Thursday, May 14, 2015. Amid tight security, hundreds of Pakistanis Thursday paid their respects at a mass funeral for 47 minority Shiites who were killed in an attack on a bus in the southern city of Karachi. (Source: AP)

People attend the funeral of Wednesday's bus attack victims in Karachi, Pakistan, Thursday, May 14, 2015. (Source: AP)

Pakistani volunteers arrange bodies of a bus attack victims at a morgue. U.N. Secretary-General Ban Ki-moon is urging Pakistan's government to take "swift measures" to protect religious minorities, including Shiite Muslims and Christians, following a number of attacks. (Source: AP)

People pray for the victims of a bus attack. (Source: AP)

People light candles to protest and show solidarity with the victims of a bus attack in Karachi, Pakistan. Gunmen stormed a bus in southern Pakistan and ordered its Shiite Muslim passengers to bow their heads before shooting them, killing dozens of people in the latest attack targeting religious minority, officials said. (Source: AP)

Women mourn as they visit a local hospital following an attack on a bus in Karachi, Pakistan. (Source: AP)

People look at a bus with blood-stained seats targeted by attackers in Karachi, Pakistan. (Source: AP)