Here is a story with some eyewiness accounts that suggest it was not an accident.
http://story.news.yahoo.com/news?tm...16/ap_wo_en_po/me_gen_israel_palestinians_147
here is an excerpt...
American protester killed by Israeli bulldozer; Arafat proposes changes that could dilute prime minister's powers
Sun Mar 16, 3:40 PM ET
By IBRAHIM BARZAK, Associated Press Writer
GAZA CITY, Gaza Strip - A bulldozer on Sunday killed an American woman trying to block Israeli troops from demolishing a building during a military operation in the Gaza Strip (news - web sites). At least one Palestinian also died.
The killing — the first of a foreign demonstrator in 29 months of fighting — came as Israelis and Palestinians wrangled over the terms of a U.S.-backed plan to end the violence and establish a Palestinian state.
Rachel Corrie, 23, a college student from Olympia, Washington, was trying to stop a demolition in the Rafah refugee camp. She died in the hospital, said Dr. Ali Moussa, a hospital administrator.
"This is a regrettable accident," said Capt. Jacob Dallal, an army spokesman. "We are dealing with a group of protesters who were acting very irresponsibly, putting everyone in danger."
The army said soldiers were looking for explosives and tunnels used to smuggle weapons.
Greg Schnabel, 28, of Chicago, said four Americans and four Britons were trying to stop Israeli troops from demolishing a building belonging to Dr. Samir Masri.
"Rachel was alone in front of the house as we were trying to get them to stop," Schnabel said. "She waved for the bulldozer to stop. She fell down and the bulldozer kept going. It had completely run over her and then it reversed and ran back over her," he said.
Several Palestinians gathered at the site, and troops opened fire, killing on Palestinians, witnesses said. The army had no comment on the incident.
Corrie was the first member of the Palestinian-backed "International Solidarity Movement" to be killed in the conflict that has claimed more than 2,200 Palestinian lives — about three times the toll on the Israeli side. Corrie was wearing a brightly colored jacket when the bulldozer hit her. She would have graduated this year from Evergreen State College in Olympia, Schnabel said.