Oil prices climbed Friday November 20, 2012 after Israeli troops fired on crowds in Gaza surging toward the border fence, killing one Palestinian.

Benchmark crude ended the trading day up 90 cents to $88.28 a barrel on the New York Mercantile Exchange.

Brent, which is used to price international varieties of oil, was up 83 cents to $111.38 a barrel.

Friday's killing is the first violence since a truce between Israel and the militant Hamas group was reached two days ago. Prior to the shooting, oil prices had been falling, thanks mostly to optimism over the stability in the region that the cease-fire agreement provided.

Nov. 14 to halt rocket fire from Gaza, unleashing some 1,500 airstrikes on Hamas-linked targets, while Hamas and other Gaza militants showered Israel with just as many rockets. The truce reached Wednesday had eased fears of a war that could broaden beyond Gaza and eventually disrupt oil supplies.

Paul Tossetti, senior director of markets and country strategies at PFC Energy, said prices were linked to the action in Gaza but that he expects this to be a temporary bump and that the cease fire would ultimately hold.

"I expect the market might back away from those concerns," he said.

Traders are also looking ahead to the next meeting of the Organization of the Petroleum Exporting Countries on Dec. 12. Tossetti said OPEC has been maintaining high levels of production but he doesn't expect anything to change at the upcoming meeting.

"It will probably be a non-event and a non-event for prices," he said.

In the U.S., motorists returning from the Thanksgiving holiday are getting the slightest bit of relief. The national average for a gallon of regular unleaded gasoline fell one-tenth of a cent to $3.43. However, that is still 10 cents higher than last Thanksgiving.