Palestinian security officials on Wednesday said they expected the last three foreign hostages held by Palestinian terrorists to be released shortly. The three hostages were among 11 foreigners kidnapped by Palestinian gunmen in response to an Israel raid on a West Bank prison on Tuesday. The other hostages were released Tuesday. The security officials said the three remaining hostages were being released in the southern Gaza town of Khan Younis and were expected in Gaza City within an hour. The officials said, however, that they could not yet confirm whether the kidnappers had turned over the hostages to Palestinian security forces.