Islamic State militants have seized parts of the ancient town of Palmyra in central Syria after fierce clashes with government troops, renewing fears the extremist group would destroy the priceless archaeological site if it reaches the ruins.
The Britain-based Syrian Observatory for Human Rights said the militants gained control of as much as a third of the town in heavy clashes during the day.
Palmyra is home to a Unesco world heritage site and is famous for its 2,000-year-old majestic Roman colonnades.
The majority of the ruins are located in Palmyra's south, and the militants entered today from the north after seizing the state security building from government forces. But their presence has sparked concerns they would destroy the ruins as they have done with major archaeological sites in neighbouring Iraq.
Following setbacks in both Syria and Iraq, IS fighters appear to have got a second wind in recent days, capturing Ramadi, capital of Iraq's largest Sunni province, and advancing in central Syria to the outskirts of Palmyra.
In Iraq, thousands of displaced people fleeing from Ramadi and the violence in the western Anbar province have poured into Baghdad after the central government waived restrictions and granted them conditional entry, a provincial official said.
The exodus is the latest in the aftermath of the fall of the city of Ramadi - the Anbar provincial capital - to IS over the weekend. The Shia-led government in Baghdad is struggling to come up with a plan to reverse the stunning loss of the city, pledging a counter-offensive and relying on Iranian-backed Shia militiamen to join the battle for Ramadi.
Athal al-Fahdawi, an Anbar councilman, said that thousands of civilians from Ramadi who were stranded on open land for days are now being allowed to cross a bridge spanning the Euphrates River and enter Baghdad province.
On Tuesday, Anbar local officials said five of the displaced residents died from exhaustion in the Bzebiz area, where the displaced had been forced to stay as they were kept away from Baghdad.
According to the International Organisation for Migration, more than 40,000 people have been displaced from Anbar province since Friday, when IS conquered Ramadi. In the past, people fleeing Anbar have been prevented from entering Baghdad due to fear that militants might mingle in with the crowds and sneak into the Iraqi capital.
Meanwhile, residents still left in Ramadi said that IS militants were urging them over loudspeakers not to be afraid and to stay in the city, already suffering from acute shortages of food and medicines. However, IS fighters were not preventing those wanting to leave the city to go, the residents said.
It is still unknown when the expected wide-scale operation to recapture Ramadi and other cities will start.
Baghdad officials and leaders of the so-called popular mobilisation units, which consist of a number of Shia militias who are fighting on the side of the Iraqi military and security forces, have repeatedly said they need time for a military build-up and reconnaissance.
When IS launched its blitz last year and entire cities and towns fell into the hands of the militants, the Iraqi government at first took only defensive measures and in many cases, soldiers and Iraqi forces abandoned their posts and fled in the face of the IS assault.
Military operations to retake entire swathes of Iraq that had fallen to IS began only months later. The US launched its air strikes campaign in August.