Two suicide bombers blew up cars rigged with explosives near a military compound and a Syrian hotel on Monday, killing at least nine people and wounding over a hundred.
State-run news agency Sana said security forces and civilians were among those killed in the north-western city of Idlib.
Syria's pro-government al-Ekhbariya TV aired footage of the aftermath from the blasts, showing torn flesh, smashed cars, twisted debris and blood stains on the pavement.
The force of the explosions tore the facade of one multistorey building, shattered windows in the area and sent debris flying for hundreds of metres.
The apparent targets - a military compound and the Carlton Hotel - are several hundred metres apart.
Two members of the UN observer team trying to salvage the April 12 ceasefire toured the site of the bombings.
A local opposition activist who only gave his first name, Ibrahim, said the observers have been staying at the Carlton, and a pro-government website reported that the hotel sustained some damage.
Hours before the suicide attacks gunmen fired rocket-propelled grenades at the central bank and a police patrol in Damascus, wounding four officers and causing light damage to the bank, according to Sana.
Syria has been rocked by a series of suicide bombings in recent months.
A Salafist group called the Al-Nusra Front to Protect the Levant claimed responsibility on Monday for a suicide bombing in central Damascus that killed at least 10 people on Friday.
On Sunday the head of the UN observer team, Major General Robert Mood, appealed to security forces and insurgents to halt the fighting.
"We want to have combined efforts focusing on the welfare of the Syrian people, true cessation of violence in all its forms," he said after his arrival in Damascus. Sixteen monitors are on the ground, but the team is to expand to 300.
On Friday the Lebanese Army seized a ship in Lebanon's territorial waters loaded with weapons reportedly destined for Syria.
The ship was to dock in northern Lebanon in preparation for transporting the weapons to insurgents in Syria, according to Lebanese military investigators.
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