May, 1970: An Israeli fishing boat was sunk by the Egyptian Navy, killing two of its crew. The Israeli Air Force launched a heavy series of bombing raids against Egyptian targets throughout the canal zone and shot down five Egyptian warplanes. Israeli aircraft sank an Egyptian destroyer and minelayer. Two Israeli soldiers were killed by Egyptian shelling and a civilian Israeli frogman was also killed by explosives planted by Egyptian frogmen while removing underwater wreckage at the port of Eilat. During the final days of the month, the IAF launched major air raids against Port Said, believing a large amphibious force is assembling in the town. On the 16th an Israeli aircraft was shot down in air combat, probably by a MiG-21.