Five people were killed Saturday by security forces in the rebellious northwestern province of Idlib and in the central protests hubs of Homs and Hama, a day after anti-regime protests which activists said cost 21 lives.
The Local Coordination Committees (LCC) said three people were killed and five wounded Saturday in Maarrat "during an incursion by tanks and 50 buses carrying members of the security forces" in Idlib province.
A fourth man was killed Saturday in Deir Baalba neighbourhood of Homs during a raid by security forces, the Britain-based Syrian Observatory for Human Rights reported.
Another man was shot dead in the evening by security forces manning a checkpoint in the village of Qastun in the province of Hama, said the Observatory.
And a political activist who was shot and wounded late Friday also died on Saturday from his injuries, said the LCC.
The Observatory said the Idlib operation aimed at tracking wanted people, as well as Hama's attorney general, Adnan al-Bakkur, who announced he quit in protest at the repression in a video posted online Wednesday.
Syrian authorities said he was kidnapped by an "armed gang" who forced him under pressure to issue "pure lies."
The Observatory also reported that 17 people were arrested Saturday in the town of Al-Hula in Homs province, where power and mobile phones were cut off as military and security reinforcements arrived in the area.
Meanwhile the body of a man "which had visible signs of torture," was left by the authorities outside his family home in Homs more than a month after he was detained, the Observatory said.
A local dissident said the family refused to take delivery of the body on Friday because "the authorities asked them to sign a report accusing terrorist gangs of killing him."
More than 2,200 people have been killed in Syria since almost daily protests began on March 15, according to the United Nations, while rights groups say more than 10,000 people are behind bars.
In addition to the oil embargo that went into effect Saturday, the EU expanded a list of around 50 people, including Assad, targeted by an assets freeze and travel ban, adding four Syrian businessmen accused of bankrolling the regime. Three firms were also added.
The oil embargo is aimed at depriving Assad's regime of a vital source of cash as the EU buys 95 percent of Syria's crude exports.
Russian Foreign Minister Sergei Lavrov criticised the measure, saying "unilateral sanctions will do no good," Russia's Interfax news agency reported.
US State Department spokeswoman Victoria Nuland, however, said the oil ban would "directly impact" the Syrian regime's financing of its crackdown and would send a "powerful signal to the Assad regime to end the violence."
Meanwhile EU foreign policy chief Catherine Ashton said the European bloc would "continue to put the pressure on and to look for ways of doing so", when asked if the EU planned more sanctions on Syria.
The ICRC delegation chief in Damascus said Kellenberger would stay in Syria until Monday afternoon and also hold talks with Prime Minister Adel Safar and Foreign Minister Walid Muallem.
A statement from Kellenberger's office said that during a previous visit in June "an understanding was reached according to which the ICRC and the Syrian Arab Red Crescent would have enhanced access to areas of unrest, and negotiations would take place concerning ICRC visits to detainees."
Asked about the possibility of visiting detainees, the ICRC delegation chief in Damascus, Marianne Gasser, said: "We are confident that we will be able to start visiting people detained by the interior ministry."