[Abcdxxxx]

See, backup. When Israel gave back Gaza, it was under the pretense of a no tolerance policy. This week, they took these prisoners, they shut down an Islamic Jihad office in Bethlehem, and they've arrested a couple dozen wanted terrorists. These are counter-terrorism operations, in response to months of daily rocket attacks into the center of Israel, and fire bombings. The PLFP are openly threatening to assasinate another Cabinet Minister, and bragging that they have the ability to do so.

The job of the monitors was to make sure those guys stayed in jail. The commitment was to Israel, with the expectation they would give a 2 week notice if they were going to leave. Israel went right in, so there must have been some advance tip off, though probably less then promised.

These were the terms agreed to when Arafat demanded jurisdiction over these criminals, in Palestinian jails.
The monitors left because they felt threatened.