Syrian opposition activists in Europe urged the international community Sunday to increase pressure on President Bashar al-Assad and called for an independent investigation into his regime's deadly crackdown.

The roughly 200 activists gathered in Brussels also said charges should be laid against those responsible for violations of human rights in the repression, and cases brought before the International Criminal Court.

Thirty-eight people, including six members of the Syrian security forces, were killed in 24 hours during clashes in the northwest town of Jisr Shughour, a Syrian rights activist said on Sunday.

"Thirty-eight people were killed in shootings in the region of Jisr Shughour, 10 yesterday and 28 today," Rami Abdul Rahman, head of the London-based Syrian Observatory for Human Rights, told Agence France Presse.

Israeli gunfire killed 22 people and wounded about 350 others on Sunday as demonstrators on the Syrian side tried to cross the ceasefire line on the annexed Golan Heights, Syria's state-run SANA news agency reported.

"The protesters, hundreds strong, were both Syrian and Palestinian," SANA said.

Palestinian President Mahmoud Abbas has told France he is ready to attend a Paris peace conference if Israel accepts talks based on the 1967 borders, an aide told AFP on Sunday.

Nimr Hammad, a political advisor to Abbas, said the president had told French Foreign Minister Alain Juppe that he agreed officially to France's proposal to host a peace conference in Paris before the end of July.

Suspected Al-Qaida militants killed nine Yemeni soldiers in two separate ambush attacks on their convoys in the southern province of Abyan, a military official said on Sunday.

"A military reinforcement convoy coming from (the main southern city of) Aden was ambushed south of (the provincial capital) Zinjibar on Saturday killing six and wounding others," said the official.

Thousands-strong funeral processions filed out of mosques and past closed shops in the central Syrian city of Hama on Saturday, as mourners buried dozens of protesters shot dead by security forces a day before.

A Syrian human rights activist increased Friday's death toll among protesters to 63, up from an initial count of 48. Most of the dead were killed in Hama after troops opened fire on crowds.

British Foreign Secretary William Hague arrived in the Libyan rebel stronghold of Benghazi on Saturday for talks with the opposition's leadership, the Foreign Office said.

Hague, who is accompanied by international development minister Andrew Mitchell, will meet with Mustafa Abdul Jalil, the chief of the rebel National Transitional Council, it said in a statement from London.

Former Egyptian finance minister Youssef Boutros Ghali was on Saturday sentenced to 30 years in prison in absentia on corruption charges, an Agence France Presse correspondent said.

Judge Magdi Ghoneim of the Cairo criminal court sentenced Ghali to 15 years for squandering public money by using cars held in customs and 15 years for abusing his position for personal gain from ministry funds.

Iran's supreme leader called on the ruling conservatives to end their divisions, in a speech on Saturday marking 22 years since the death of revolutionary leader Ayatollah Ruhollah Khomeini.

"In the country there are different political views... Do not deprive someone of security if he does not seek regime change or betrayal, or does not want to carry out enemy orders, but does not share your view," said Ayatollah Ali Khamenei.

Egyptian officials at the Rafah border with the Gaza Strip closed the crossing on Saturday, Palestinian police told Agence France Presse.

Ayub Abu Shaa, head of the Hamas police unit at Rafah, said phone calls to the Egyptian side went unanswered and a crowd of hundreds of Palestinians seeking to cross to Egypt were faced with a locked gate.