An autopsy on a suicide bomber who killed five Israeli tourists and a bus driver in Bulgaria show he was different from an "Arab-looking" suspect cited by witnesses, a doctor said on Sunday.

Galina Mileva, who was involved in the post-mortem examination, told BNT television on Sunday that the man "had a white face, light eyes, and very thick brown hair. The facial bones were shattered in the explosion."

A top U.S. official said on Sunday that Washington has given $100 million in aid to Jordan to help host tens of thousands of Syrians who have fled the unrest back home and taken refuge in the kingdom.

U.S. ambassador to Jordan, E. Jones, said that the U.S. aid will also help Jordan meet its growing energy needs in light of the repeated cut-offs occurring from unstable gas supplies from Egypt.

Hizbullah denied on Sunday that it would transfer chemical weapons from Syria to Lebanon if the regime of President Bashar Assad collapsed, the Kuwaiti al-Rai newspaper reported.

“It’s not the intention of Hizbullah to acquire such weapons, and Syria isn’t willing to export any for several reasons,” a source close to Hizbullah told the daily.

Attackers on Sunday blew up a gas pipeline in Egypt's Sinai used to export fuel to Israel and Jordan, the 15th such attack since 2011, the official MENA news agency reported.

Witnesses told Agence France Presse they heard a loud explosion and saw flames from the site of the explosion near the northern Sinai town of El-Arish.

Bulgarian police along with the CIA, FBI and Interpol are struggling to identify a suicide bomber who killed six people, including five Israelis, as the United States said the attack bore the "hallmarks" of Hizbullah.

Investigators have released CCTV footage of the person they believe carried out Wednesday's attack at the airport of the Black Sea town of Burgas on a bus carrying Israeli holidaymakers, which also claimed the life of the Bulgarian driver.

Cyprus police have applied to hold a young Lebanese man for a further week over allegations he was helping to plan an attack on Israeli tourists, media on the island reported on Friday.

The 24-year-old, who holds a Swedish passport, appeared at a closed-door hearing on Friday and a court in the island's second city Limassol will decide on Monday whether he should remain in custody, the reports said.

An Israeli protester who set himself alight during a social justice demonstration last weekend died of his injuries on Friday, media reported.

Moshe Silman, 57, set himself ablaze at a demonstration in the city of Tel Aviv on Saturday night and suffered extensive burns. He died at Tel Hashomer hospital near Tel Aviv, media said.

The Pentagon said Friday there are signs that Hizbullah may have orchestrated a suicide bombing attack on Israeli tourists in Bulgaria this week.

"The attack does bear some of the hallmarks of Hizbullah but we're not in a position to make any final determination on who was responsible," Pentagon press secretary George Little told reporters.

Palestinian militants in the Gaza Strip fired two rockets into southern Israel on Friday where they hit without causing casualties or damage, an Israeli military spokeswoman said.

"Two rockets hit the Eshkol region in southern Israel, at two in the morning and three in the afternoon. Neither caused casualties or damage," she told Agence France Presse.

Cypriot police said on Thursday they are beefing up security to protect Israeli interests following a suicide bombing in Bulgaria that claimed six lives, including five Israeli tourists.

"Cyprus has taken additional measures at various places where there are Israeli interests in the light of the attack in Bulgaria," police spokesman Andreas Angelides told reporters.