Two Egyptian army officers were killed on Saturday when a tunnel they entered under the Gaza-Sinai border collapsed on top of them, security sources said. Another soldier was injured by the collapse and two others are missing. Egyptian defense officials said the tunnel collapse took place near the Rahma neighborhood on the Egyptian side of Rafah.The tunnel was first uncovered by Egyptian border patrolmen. When five soldiers entered the tunnel, it promptly collapsed, killing officers Mohammed Majdi and Islam Ahmed. The injured soldier has been identified as Ahmed Talas Ahmed.Palestinians in Gaza are aiding the Egyptian forces in the search for the missing soldiers.