A grassroots peace concert calling for a two-state solution to the Israel-Palestinian conflict was called off Sunday after threats were made to Palestinians supporting the event.

The New York-based OneVoice organization had planned to hold simultaneous concerts on Thursday in the Israeli city of Tel Aviv and the West Bank town of Jericho, with Canadian rock star Bryan Adams headlining.

Canadian rocker Bryan Adams, seen here in 2004, was slated to headline two concerts for peace on Thursday in the West Bank town of Jericho and also Tel Aviv, Israel.Canadian rocker Bryan Adams, seen here in 2004, was slated to headline two concerts for peace on Thursday in the West Bank town of Jericho and also Tel Aviv, Israel.
(Canadian Press)

The Jericho concert was called off last Friday due to security concerns, including threats to blow up the West Bank office of OneVoice, said group founder Daniel Lubetzky. On Sunday, the Tel Aviv concert was cancelled in solidarity.

"Our mission is not to entertain … it is to mobilize moderate voices," said Lubetzky, a New York businessman. "If we have to postpone, we have to postpone."

Organizers of OneVoice aim to collect a million signatures from Israelis and Palestinians calling for their leaders to negotiate a final peace settlement within a year.

The concert was meant to support the signature campaign, with those attending the event free of charge but required to sign the petition.

Some Palestinians have criticized the organization, which they said was weak on upholding Palestinian demands, including the right for refugees to return to the lands they fled, or were forced to flee, following the Israeli-Arab war in 1948.

Leading Palestinians who initially supported the event have also distanced themselves from it. However, OneVoice does not set out a specific mandate.

Around 600,000 Palestinians and Israelis signed on to support the organization's call for negotiations to begin between both sides. It also has received support from Hollywood stars such as Brad Pitt, Jennifer Aniston, Rhea Perlman, Danny de Vito and Jason Alexander.

Adams, whose smash hits include Heaven, Summer of '69 and (Everything I Do) I Do It For You, was to have performed at both concerts, along with Israeli artists in Tel Aviv and Palestinian performers in Jericho.