Jailed Palestinian leader Marwan Barghouthi urged the Palestinian leadership to give its backing to “armed resistance” against Israel in a letter published Tuesday as a wave of violence surged. The call came after months of clashes in and around annexed East Jerusalem and a growing number of deadly Palestinian attacks by lone individuals.

In a letter to mark 10 years since the death of veteran leader Yasser Arafat, Barghouthi said that “choosing global and armed resistance” was being “faithful to Arafat’s legacy, to his ideas, and his principles for which tens of thousands died as martyrs.”

Barghouthi, who Israeli authorities say led the Second Intifada from 2000 to 2005, wrote the letter from his cell in Israel’s Hadarim prison where he is serving five life sentences for alleged involvement in attacks on Israeli targets.

A senior figure within the Fatah movement of President Mahmoud Abbas, Barghouthi was arrested in 2002 and sentenced two years later. Barghouthi has said he never supported attacks on civilians inside Israel and in recent years has thrown his support behind peaceful resistance.

He still wields huge influence from inside prison and is considered the only serious challenger to Abbas as president, with surveys regularly naming him as favorite to win elections should he be released from jail.

“It is imperative to reconsider our choice of resistance as a way of defeating the occupier,” he wrote.

With religious tensions also surging at the flashpoint Al-Aqsa Mosque compound in Jerusalem, a site holy to both Muslims and Jews, Barghouthi urged the Palestinian leadership to take action and make good on threats to end security cooperation with Israel.

“The Palestinian Authority must review its priorities and its mission … and put an immediate end to security cooperation which is only strengthening the occupier,” he said.

He also remarked on the circumstances of Arafat’s death, saying his “assassination” was the result of “an official Israeli-American decision.”

Arafat died in a military hospital near Paris on Nov. 11, 2004 in circumstances that have never been clear. Two years ago, Swiss experts who examined his personal effects reported finding “abnormal” levels of polonium, an extremely radioactive toxin, fueling the widespread Palestinian belief that he was poisoned by Israel. Israel has repeatedly denied any role in Arafat’s death. SAPA