A rebel-claimed bombing Thursday in the northern Syrian city of Aleppo levelled a once luxurious hotel near the ancient Citadel that government troops used as a military base, causing multiple casualties, activists and militants said.
Syrian state television said the explosion struck the Carlton Hotel in a government-held area on the edge of a contested neighbourhood in the old part of Aleppo.
The Britain-based Syrian Observatory for Human Rights, which maintains a network of activists on the ground, said at least 14 soldiers were killed in the blast. The Islamic Front, Syria's biggest rebel alliance which claimed the attack, claimed to have killed 50 soldiers. Both groups did not say how they know how many soldiers died, and the claims could not be independently verified.
In a live broadcast from the site of blast, the station's correspondent in Aleppo stood on a huge pile of rubble with twisted metal and palm trees sticking out, saying that the army had been using the building as a base and soldiers were positioned there at the time of the explosion. In the broadcast, Syrian TV did not mention casualties but said the rebels blew up the building by tunneling underneath and planting explosives.
"They use tunnels like rats because they cannot face the Syrian Arab Army," the correspondent said, adding that the explosion felt like an earthquake to those around Aleppo.
The attack was the second carried out by the Islamic Front against the Carlton. The first, allegedly carried out also through explosives-packed tunnels, caused a partial collapse of the building in February. The Front, an alliance of several Islamic groups fighting to topple Assad, appears to favour this technique and has used it to carry out deadly attacks against government forces in Aleppo and Idlib provinces.
Thursday's explosion was much more powerful and sent an enormous mushroom of grey smoke into the sky and over the ancient city, according to a video posted online by activists. The video appeared genuine, matching Associated Press' reporting on the blast.
The explosion was a blow to President Bashar Assad's government in the north as his troops prepare to regain control of the central city of Homs following last week's cease-fire agreement after a fierce, two-year battle with the rebels trying to oust him.
Rebels were completing their withdrawal from Homs on Thursday, a day after hundreds of fighters evacuated from the city under the cease-fire deal.
No such agreement appears to be in sight in Aleppo, Syria's largest city and former commercial hub. The city has been carved up into opposition- and government-held areas since the rebels launched an offensive there in mid-2012, capturing territory along Syria's northern border with Turkey.
In recent months, government aircraft relentlessly has bombed rebel-held areas of the city and the opposition fighters have hit back, firing mortars into government-held areas. The rebels also have detonated car bombs in residential areas, killing dozens of people.
The Islamic Front posted a statement on its official Twitter account Thursday saying that its "fighters this morning levelled the Carlton Hotel barracks in Old Aleppo and a number of buildings near it, killing 50 soldiers."
The Observatory said Islamic Front fighters planted a huge amount of explosives in a tunnel they dug below the hotel and detonated it remotely. It said the hotel was completely destroyed in the blast and at least 14 government soldiers were killed in the blast.
The Syrian government does not publicize its casualties in the civil war.
Meanwhile Thursday, more rebels were expected to leave the central city of Homs as an evacuation of opposition fighters moves into its second day.
Homs Gov. Talal Barazi told Syrian state TV that that the evacuation process is being conducted in "positive atmosphere." He said Homs will be declared a "secure" city once the army moves in later Thursday.