Palestinian security forces in the West Bank recently arrested a Hamas cell that planned a suicide attack in Israel, Palestinian Authority Foreign Minister Riad Malki said Monday. A videotape showing a suicide bomber detailing his intentions to blow up an Israeli target was also seized, Malki said at a news conference. The announcement came a week before US President George W. Bush visits the region to promote peace talks between Israel and the Palestinians. The Palestinians are eager to prove they are cracking down on militants which is a central demand of the negotiations. "We confiscated huge amounts of mercury in Nablus," Malki told reporters. "This mercury is used for explosives and especially in preparing detonators," he said. Malki refused to elaborate or answer reporters' questions about the incident. He did not show the videotape to reporters or release the name of the alleged bomber. The Israeli military said it had no knowledge of the case.