At least 28 people, many of them women and children hoping for humanitarian aid, were killed earlier today when a suicide bomber detonated his device in a square in Central Baghdad.Several Iraqi police officers also died. They were helping distribute the relief supplies to the displaced families. Several hours later, at least 45 people died when a second suicide bomber targeted a crowded restaurant near Baquba in the volatile Diyala Province. Most are believed to have been Iranian pilgrims visiting Shi-ite Muslim religious sites in the region. 63 people were wounded. In a separate development, Iraqi state television is reporting that Abu Omar al Bagdadi, the alleged leader of an insurgent group linked to Al qaeda, has been arrested. The group is one of a handful of Sunni Arab extremist organisations blamed for suicide bombings in the country.