DAMASCUS, Syria  
   (AP) -- Government troops fired tank shells and artillery in heavy 
clashes between Syrian forces and rebels Sunday on the edge of Damascus,
 where the military has been pushing its offensive to retake key 
districts that have been in opposition hands for months.
The
 Syrian army has seized the momentum in the civil war over the past 
three months, wresting back territory lost to rebel forces and 
solidifying its hold over contested areas, particularly on the fringes 
of Damascus. Two of the embattled districts are Jobar and Qaboun, from 
which rebels frequently launch mortar rounds on the heart of the 
capital.
A Syrian military commander said 
forces loyal to President Bashar Assad have recaptured 60 percent of 
Jobar, south of Qaboun, and were trying to retake the rest. The 
commander talked to reporters Sunday during a military escorted tour of 
Jobar organized by the Information Ministry. His claim could not be 
independently verified.
An Associated Press 
reporter on the tour saw widespread destruction that pointed to heavy 
fighting in the neighborhood. Marble tile factories were destroyed. 
Reporters made their way in the devastated area by climbing through 
holes knocked in walls because of warnings of rebel snipers in the area.
At
 least two bodies, apparently those of rebel gunmen, lay on the floor of
 a bunker described by the official as a "terrorist" hideout.
"The
 army is advancing rapidly in Jobar ... the area will be secured in the 
next few days according to a well-studied plan," the commander said. He 
declined to be named in line with regulations.
Jobar
 is near the road linking Damascus with its eastern suburbs known as 
Eastern Ghouta. Rebels have been using the road to transport weapons and
 other supplies to the capital, the seat of Assad's power.
The commander said the Jobar-Qaboun axis was important to "cleanse Ghouta from terrorist groups."
Assad's
 government routinely describes the rebels fighting to overthrow him as 
terrorists playing out a foreign conspiracy hatched by Israel, the 
United States and some of its Arab allies in the region, like Qatar and 
Saudi Arabia.
During the tour of Jobar, 
reporters were taken to a hideout the army said it seized a day earlier 
after killing 30 rebels and their leader there. Reporters were shown RPG
 mortar rounds and explosive devices, as well as an alleged chemical 
material with a strong odor.
Arabic graffiti 
on the walls read: "The al-Tawhid Brigade," and "the Islamic State of 
Iraq and the Levant" - names of militant groups fighting to topple 
Assad.
Sunday's tour came as Syria's main 
Western-backed opposition group claimed that 200 civilians were trapped 
in a mosque in Qaboun as fighting raged outside between rebels and 
Assad's army. It warned that thousands of civilians in Qaboun could be 
"massacred" by Assad's army as armored vehicles and elite forces move 
in.
The U.K.-based Syrian Observatory for 
Human Rights, which relies on a network of activists on the ground, said
 dozens of people were held captive Saturday by regime forces in the 
basement of the al-Omari mosque, but they were able to escape when 
clashes broke out between rebel and regime forces in the perimeter of 
the mosque, and the troops retreated.
It said 13 people, including seven fighters, died in the shelling of Qaboun Sunday.
"They
 (troops) are using tanks and artillery and are trying to break into 
Qaboun. The shelling is very intense and there is a lot of smoke," said 
an activist in the area, speaking via Skype on condition of anonymity, 
fearing retribution.
"This is day 26 of a bombing campaign, and they still haven't been able to break Qaboun," he said.
Later
 Sunday, a powerful bomb explosion rocked the Deir Atiyeh town north of 
Damascus, killing and wounding a number of people, activists said. The 
bomb went off near a police station in a densely populated area, but 
most of the casualties were civilians, according to the Observatory and 
the Military Council for Damascus and its Suburbs, a rebel group.
In
 Washington, U.S. officials said Israel targeted advanced anti-ship 
cruise missiles near Syria's principal port city in an airstrike earlier
 this month, according to a report by The New York Times. It cited the 
officials as saying the attack on July 5 near Latakia targeted advanced 
Russian-made Yakhont missiles that Russia sold to Syria.
There was no immediate comment from Assad's government, whose key political ally and arms supplier is Russia.
Asked
 about the reports on the CBS-TV show "Face the Nation," Israeli Prime 
Minister Benjamin Netanyahu refused to confirm or deny Israeli 
involvement.
He insisted that he will not allow "dangerous weapons" to reach Lebanon's Hezbollah militants.
 Halaby reported from Amman, Jordan. 
Associated Press writers Zeina Karam in Beirut and Josef Federman in 
Jerusalem contributed to this report.
From AP.