In this late Friday, April, 18, 2014 photo, Egyptian police investigate the site of a bombing that killed a police officer next to a traffic post, in Lebanon Square, Cairo, Egypt. In an audio interview with al-Qaida media arm as-Sahab posted early Saturday, April 19, 2014, Al-Qaida leader Ayman al-Zawahri has given his blessing to attacks of Egyptian jihadis on the police and army, but said they should avoid harming civilians. More than 430 police officers and army personnel have been killed in terrorist attacks since mass demonstrations against Morsi on June 30, according to government figures. (AP Photo/Hussein Tallal), APTOPIX