CAIRO - Egyptian business tycoon Naguib Sawiris has announced offering one million dollars in reward for anyone, who will offer information leading to the arrest of those involved in a deadly attack at a church in the coastal city of Alexandria. "This reward is a natural response to what happened and the least that can be offered," Sawiris, a Christian, told official Egyptian television Monday night. Around 21 people were killed nearly 100 others injured when a nail-packed bomb exploded outside the Two Saints Church in Alexandria half an hour after the start of 2011. Urging Copts to calm down "lest they play into the hands " of the masterminds of the attack, Sawiris said that police protected churches and Egypt's Musims and Christians. Angry Copts have staged a series of protests and clashed with police in several parts of the country.