CBNNews.com - KISSUFIM CROSSING, Israel - An IDF (Israel Defense Forces) non-commissioned officer was killed and three soldiers injured, one seriously, when Palestinians detonated a bomb along the security fence near the Kissufim crossing.

A helicopter transported the critically wounded officer to Soroka Medical Center in Beersheva, while the two moderately wounded soldiers were taken by ambulance.

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In the firefight following the attack, Palestinian gunmen opened fire on the troops, who returned fire. IAF (Israel Air Force) helicopters provided air support.

A farmer was killed in the clashes, according to Palestinian sources.

Tuesday morning's attack was the not the first time Palestinian gunmen fired on soldiers since the IDF ended its three-week operation in Gaza.

In two separate incidents a week ago, Palestinians opened fire on IDF troops near the border and also fired eight mortar shells on southern Israeli communities.

"If Hamas repeats its unruly attacks, it will be surprised once again by Israel's crushing hand. I suggest they don't try it," outgoing Prime Minister Ehud Olmert said.

"Hamas is not part of the arrangement we've reached," Olmert said. "Terror organizations have no part and will have no part in the agreements reached," he said.

Defense Minister Ehud Barak said Israel would respond to any violation of the cease-fire.

The attack comes the day before newly appointed US Middle East envoy George Mitchell is due to arrive in the region.