Opposition MP Ahmad al-Tibi said the army had used a "secret banned weapon" in the raid and accused it of employing military censorship to stop the publication of details related to the issue.

"This concerns banned munitions whose explosion had an impact that extended over several dozen metres (yards)," he said in a statement.

Twelve Palestinians, including two wanted activists, were killed in the Israeli raid on October 20, which targeted a car in the Gaza Strip refugee camp of Nusseirat.

"Air Force commander Dan Halutz lied in public when he said after the raid that the Air Force used Hellfire missiles that were fired by Apache helicopters. It was not Apaches that launched the banned weapon," he charged.

Meanwhile fellow member of parliament Yossi Sarid, of the left-wing Meretz party, threatened to unveil "confidential information" over the Nusseirat raid.

Sarid made his threat after Defence Minister Shaul Mofaz refused to tell him the type weapons used in the raid, during a meeting of parliament's defence and foreign affairs committee, according to the Haaretz daily.

According to Sarid, the army used "powerful munitions with an unusually large range of impact".

Israeli public radio said the army had admitted that arms other than Hellfire missiles had been used in the Nusseirat attack.

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