* Corpses lie in streets or under rubble of homes
* Syrian war planes being used - ITV News
* Residents call on Red Cross to remove bodies (Adds comment on Syrian military jets)
By Mariam Karouny and Oliver Holmes
BEIRUT, June 30 (Reuters) - Syrian government forces pushed their way into Douma on Saturday after weeks of siege and shelling, and fleeing residents spoke of corpses in the streets of the town near the capital Damascus.
The residents said hundreds of people were fleeing the town as government forces swept the streets in search of rebels trying to overthrow President Bashar al-Assad.
They reported many bodies buried under the rubble of houses in the town of half a million people, 15 km (10 miles) from Damascus.
It was not possible to immediately verify the reports, on the day world powers met in Geneva to try to find a way to resolve the increasingly bloody conflict in Syria.
A local man who gave his name only as Abdullah said he and his five children left Douma on Saturday morning.
"I saw at least three bodies on a street corner, some houses were destroyed, others were on fire. Only a few people remained inside the city. Those who can, leave," the 50-year-old said by telephone from a nearby town.
"I saw a body on the side of the street and dogs were gathering around it, it was really horrible ... we are all living as refugees inside our country," he added.
Abdullah left in a convoy of 200 people from his neighbourhood. He said eight people were packed into each car. They passed through four checkpoints where soldiers in "full gear" eyed their identity cards before allowing them through.
Syrian forces have used similar tactics countrywide, activists say, of long sieges and shelling before raids.
A correspondent working for Britain's ITV News inside Syria said on Friday that Syrian war planes were being used to bomb districts of the town.
"For the first time in this conflict I heard twice the unmistakable sound of a war plane high above, then this," ITV International Editor Bill Neely said to footage of black smoke over Douma and the sound of a thunderous explosion.
"This is the first time we can categorically say the Syrian air force has been deployed," Neely added, crouching in a building overlooking Douma.
CALL FOR RED CROSS HELP
A 16-month-old uprising against Assad has morphed into a fight between rebels and the government, which labels armed and unarmed dissidents as "terrorists".
Other residents reported hundreds of people fleeing Douma.
Abo Omar, another resident, said rebels withdrew from Douma on Friday night after an intense 10-day government offensive.
"How can the rebels continue fighting with limited guns, facing tanks and helicopters? Now Assad's army is in control of the town," he said, adding that hundreds had been arrested.
"We are calling on the Red Cross and the (Syrian) Red Crescent to go inside the town and remove the bodies. Some of the bodies have started to decay," Omar said.
He said many of the dead were buried under the rubble of houses.
Mahmoud Doumany, an opposition activist who also left the town, said: "There is no electricity or water, no communication. The situation was really horrible.
"Security forces are going into hospitals and we fear for the lives of the wounded."
Syrian forces on Saturday fired mortar bombs into urban areas, activists said.
Footage posted by opposition activists in the eastern desert city of Deir al-Zor showed smoke rising from apartment blocks as continuous explosions rang out.
Activists also reported shelling in Homs, Idlib and Deraa.
The Syrian Observatory for Human Rights said government shelling and heavy clashes between the army and members of the rebel Free Syrian Army had killed 22 people so far on Saturday.
Opposition activists accuse the international community of inaction. Diplomacy has failed to produce an agreement between Western powers, who favour the opposition, and Russia, which has used its veto power at the United Nations Security Council to block Western and Arab moves to drive Assad from power. (Editing by Pravin Char)