Israeli Prime Minister Benjamin Netanyahu told U.N. Secretary General Ban Ki-moon on Friday that he would be making "a big mistake" if he attended an international summit in Iran.

"Mr. Secretary General, you do not belong in Tehran," a statement from Netanyahu's office quoted the premier as telling Ban in a telephone conversation.

Syrian troops and rebels fought fierce battles on Friday in the city of Aleppo, where several people died when a shell crashed into a bakery as hundreds queued for bread, Agence France Presse reported.

The Local Coordination Committees, the main activist group spurring protests on the ground, said regime forces shot dead 115 civilians and rebels across the country.

The United States plans new sanctions targeting Syrian President Bashar Assad's regime and its supporters in a bid to put further pressure on Damascus, a U.S. State Department official said Friday.

"...One of the key forms of pressure is economic sanctions, which in the coming days or very shortly we will be tightening further with additional sanctions (on) both Syrian entities and those who are supporting the efforts of the Syrian government to oppress its own people," the official said.

Police fired tear gas and rubber bullets late Thursday to disperse a second anti-government protest in the central Tunisian town of Sidi Bouzid, birthplace of last year's revolution.

Some 800 demonstrators furious at police intervention against a protest earlier in the day threw stones at security forces who again replied with rubber bullets and tear gas.

The conflict in Syria has caused a "severe internal displacement crisis" due to disrespect for international humanitarian laws, the U.N. special rapporteur on the rights of the displaced said on Thursday.

"The special rapporteur called upon all Syrian authorities and parties to the conflict to ensure respect for international law, including human rights and humanitarian law...and prevent conditions that may lead to further forced internal displacement of persons," a statement said.

Britain will give Syrian rebels £5 million in assistance including body armor and communications equipment for their fight against President Bashar Assad, Foreign Secretary William Hague said Friday.

Hague said Britain would not provide weapons but would step up its contacts with opposition groups, especially the Free Syrian Army, to lay the ground for a political solution if Assad falls.

More than 2,500 Syrians fled to Turkey overnight amid escalating clashes in Syria, a Turkish official told Agence France Presse on Friday.

The latest arrivals brought the number of Syrian refugees in Turkey to some 53,000, said the official from the country's Disaster and Emergency Administration.

Syrian rebels vowed to fight on in Aleppo a day after being driven out of a key district under heavy shellfire, which was targeting other parts of the strategic city on Friday.

A rebel commander, Hossam Abu Mohammed, said his men were still fighting in parts of Aleppo's southwestern district of Salaheddin after most fled on Thursday under heavy bombing and advancing troops.

A bombing and a shooting targeted a police patrol and a city council member in Iraq, killing four people and wounding four others on Friday, security and medical officials said.

"Three policemen were killed and two others wounded by a bomb targeting their patrol in Al-Muqdadiyah this morning," said a police lieutenant colonel in the town, which lies in restive Diyala province.

Talk of a possible military strike on Iran's nuclear facilities dominated the Israeli press on Friday, a day after Defense Minister Ehud Barak said the issue had become more "urgent."

"(Prime Minister Benjamin) Netanyahu and Barak are determined to attack in Iran in the autumn," trumpeted a front-page headline in top-selling daily Yediot Aharonot.