Around 64,000 Syrians are stranded at the border with Jordan after intensified violence around Aleppo, Jordanian border guards said on Thursday.

The kingdom, which is already home to more than 630,000 Syrian refugees, introduced additional security checks at the Hadalat and Rokbane border crossings at the start of the year, leading tens of thousands more to congregate along the frontier.

A double bomb attack on Thursday in central Syria killed at least 10 civilians and wounded 40 others, according to the Syrian Observatory for Human Rights.

State television also reported dead and wounded in the suicide attack and car bombing in a square in Mukharram al-Fawqani in Homs province.

At least 22 air strikes pounded a key rebel bastion east of the Syrian capital on Wednesday after a local freeze on fighting expired overnight, a monitoring group said.

The Syrian Observatory for Human Rights said the suspected regime raids hit Eastern Ghouta as clashes with rebels erupted.

Russia hoped Tuesday a new ceasefire could be announced within hours for Syria's battered city of Aleppo, where fresh fighting including rocket fire on a maternity hospital left at least 16 dead.

As the city was struck by some of its heaviest reported clashes in days, Russian Foreign Minister Sergei Lavrov said efforts were under way to agree a freeze in the fighting.

Rebel fire on a hospital in a government-controlled neighborhood of Syria's second city Aleppo killed three women and wounded another 17 people on Tuesday, state media reported.

The rockets hit Al-Dabbeet hospital in the Muhafaza district, state news agency SANA said.

Syria's civil war is "in many ways out of control" U.S. Secretary of State John Kerry warned Monday, vowing to work hard in the "coming hours" to salvage a tattered truce.

Speaking after talks with U.N. envoy Staffan de Mistura, Kerry said he would call his Russian counterpart Sergei Lavrov later Monday to press for the ceasefire to be restored.

Deputy head of Hizbullah Sheikh Nabil Qaouq held on Monday Saudi Arabia responsible for the ongoing conflict in Syria, accusing it of being the main backer of takfiri and al-Qaida-linked groups, reported the National News Agency.

He said: “The Saudi regime is chiefly responsible for the ongoing bloody massacres taking place in Aleppo.”

Terrified residents fled a new wave of air strikes on rebel-held areas of Syria's divided city of Aleppo on Saturday, as key regime backer Russia rejected calls to rein in its ally.

Aleppo was left out of a new temporary U.S.-Russian brokered truce that appeared to be holding in the regime stronghold of Latakia as well as Damascus and the nearby rebel bastion of Eastern Ghouta.

Russia's foreign ministry on Friday denounced an attack on its consulate in Syria's war-ravaged city of Aleppo, accusing jihadists of shelling the compound.

"The building of Russia's Consulate General in Aleppo came under sudden mortar attack on April 28 around 3 pm Moscow time (1200 GMT)," it said in a statement.

Regime aircraft pounded rebel areas of Syria's second city Aleppo on Friday, hitting a clinic just days after a strike destroyed a hospital, killing two doctors and sparking an international outcry.

More than 200 civilians have been killed in Aleppo over the past week as rebels have pounded government-held neighborhoods with rocket and artillery fire and the regime has hit rebel areas with air raids.