US aircraft carrier strike group arrives in Middle East

The White Helmets said they have searched a second prison in Damascus within a training center for the Assad regime's State Security Branch.

"Our teams conducted searches and inspections inside the prison and the basement, which contains collective and solitary confinement cells, where innocent people were detained and brutally tortured. The teams found papers with numbers of soldiers who worked in the branch. The teams contacted them and they confirmed that the cells were only within the basement and that there were no hidden detention centers in the place," the White Helmets said in a statement.

After searching Monday for secret prisons and cells, the White Helmets are now demanding Bashar Assad hand over the locations of the regime's secret prisons along with a list of detainees being held.

Many believe there are still prisons that have yet to be discovered.

"The defunct Assad regime has practiced indescribable brutality and criminality in killing, arresting, and torturing Syrians, prolonging the period of oppression and pain in the hearts of mothers. Justice for all victims and holding accountable the perpetrators of crimes against Syrians is the first step in healing wounds and supporting peace-building efforts," the White Helmets said in a statement Tuesday.

The White Helmets said they sent a request to the United Nations through an international mediator to demand that Russia pressure Assad to release the information so the prisoners can be reached.

Israel will act decisively against positions in Syria if Hezbollah reemerges, but it has "no intention of interfering in the internal affairs of Syria," Prime Minister Benjamin Netanyahu said in remarks Tuesday.

"I authorized the Air Force to bomb strategic military capabilities left behind by the Syrian army, so that they would not fall into the hands of the jihadists," Netanyahu said.

"We want relations with the new regime in Syria. But if this regime allows Iran to re-establish itself in Syria, or allows the transfer of Iranian weapons or any other weapons to Hezbollah, or attacks us -- we will respond forcefully and we will exact a heavy price from him," Netanyahu said.

The Israel Defense Forces said it has hit about 320 targets, destroying almost all of the Assad regime army's capability throughout Syria, from Damascus to Tartus.

"The operation destroyed dozens of fighter jets, combat helicopters, radars, surface-to-air missile batteries, ships, surface-to-surface missiles, rockets, weapons production sites, weapons depots, Scud missiles, cruise missiles, coastal missiles, sea-to-sea missiles, UAVs, and more," the IDF said in a statement Tuesday.

"The operation is still ongoing on the ground, with the IDF ground forces operating in the buffer zone. There, too, the IDF is working to establish a grip on the area, destroy weapons, and ensure that they do not fall into unwanted hands," the IDF said.

-ABC News' Jordana Miller