A Lebanese blogger who was apparently linked to jailed Egyptian blogger Maikel Nabil Sanad has been denied entry to Egypt on Monday, a Cairo airport official and a media watchdog said.

Imad Bazzi's name "was on a list of people banned from entering at the request of a security apparatus," said the official, adding that the blogger who arrived at 0800 GMT was put on a plane back to Lebanon at 1500 GMT.

The trial of Hosni Mubarak and his two sons' trial was postponed on Monday after the prosecution and defense lawyers clashed in the court room.

Dozens of the ousted Egyptian president's supporters and opponents clashed near the Cairo court before he arrived on a stretcher.

Egypt's military has started to close smuggling tunnels to Gaza, witnesses said on Saturday, amid Israeli warnings of plans by Gazan militants to attack the Jewish state through Egyptian territory.

Witnesses along the 12-kilometre border with the Islamist Hamas-controlled Palestinian enclave said soldiers had begun using earth-moving equipment to seal tunnel openings with rocks and sand.

Jordan's energy czar says his country will sign an agreement with Egypt next month to resume natural gas supplies.

Energy Minister Khaled Toukan says several attacks this year on Egypt's pipeline delivering the fuel may prompt Jordan to look for alternatives, but Jordan will now try to use Egyptian gas to meet its energy needs.

The brother of the Islamist assassin of former president Anwar Sadat returned to Egypt from exile in Iran on Sunday and surrendered to the authorities, an Agence France Presse correspondent reported.

Mohammed Shawki al-Islamboulli, who was sentenced to death in absentia for leading the Islamist network Al-Gamaa Al-Islamiyya in the mid-1990s, was whisked away by officials from the military prosecutor's office as he arrived in Cairo.

Some 200 people protested Friday in front of the Israeli embassy in Egypt's capital demanding the ambassador's expulsion, after five Egyptian policemen were killed along the border with Israel last week.

We want "blood for blood" said one of the demonstrators, Mahmoud Ibrahim, who said he was a brother of one of the dead policemen. "We want revenge, we do not want compensation ... We want them to be punished."

Jordan on Sunday urged an "immediate" halt to Israel's "military escalation" in the Gaza Strip, warning that it threatens regional stability.

"Jordan rejects and condemns Israel's military escalation and operations in Gaza that have killed civilians as well as Egyptian officers," information minister Abdullah Abu Rumman said in a statement carried by the state-run Petra news agency.

Rockets fired from Gaza early Sunday landed across the border in Egypt but caused no casualties, state television reported.

"Several rockets from the Gaza Strip landed this morning in Egyptian territory in the region west of the Rafah terminal, without causing casualties," the television reported.

Israelis and Palestinians woke up to a fourth day of violence on Sunday, with militants firing 17 rockets into Israel despite an unusually quiet night in Gaza just hours after a rocket killed an Israeli.

Tensions in and around the Gaza Strip have soared since Thursday when militants staged a series of bloody shooting attacks in the Negev desert, killing eight Israelis and prompting a wave of bloody tit-for-tat exchanges.

World powers warned Saturday there is a "risk of escalation" after three days of fighting over Gaza that has already seen critical relations between Israel and Egypt plummet.

The European Union, Russia, the U.N. and the United States urged the region's key players to hit the brakes, as rockets fired from Gaza wounded three people -- ironically Palestinians in Israel -- and the Jewish state's air force responded with attacks on the coastal enclave.