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.