U.N. Secretary-General Ban Ki-moon Monday condemned Sunday's terrorist attack on the Pakistani side of the Wagah border with India and urged Pakistani authorities to bring those responsible to justice. In a statement, Ban condemned "in the strongest terms" the attack, which, according to media reports, killed more than 50 people and wounded 100 others. The U.N. chief expressed his condolences to the families of those killed in the attack and to the people and government of Pakistan. He also wished the wounded a quick recovery. "Such terrorist acts are not justifiable under any circumstances," Ban said, urging Pakistani authorities to bring the perpetrators to justice.