Cairo - The U.S. Embassy mourns those killed in the attack today on the Coptic Orthodox Cathedral in Cairo. We strongly condemn this hateful act of violence, which targeted Egypt's Christian community. We stand with Egypt in opposing all acts of terrorism as we support a stable, secure, prosperous future for all Egyptians. An explosion near the Coptic Cathedral in the Egyptian capital Cairo kills at least 25 people. Egypt's presidential administration announced mourning for three days across the country after an attack at a church in Cairo, according to official statement.