On the second day of intense bombing campaign, Syrian and Russian warplanes have attacked Syria's second biggest city of Aleppo hours after the announcement of a major new offensive. Dozens of airstrikes have pounded opposition-held eastern Aleppo, hitting three medical facilities and damaging underground shelters used by residents to hide from bombings, residents said on Friday.Dozens of people have been killed, including a number of children, according to the Syrian Observatory for Human Rights. The airstrikes include the use of incendiary bombs and cluster munitions, according to residents, who blame the Bashar al-Assad forces and the Russians, the main backer of the government.Amid ongoing heavy aerial bombardment, residents stated that there was no way to leave the affected areas and demanded the opening of a corridor so they can escape the airstrikes. The Syrian government had promised, at the onset of the latest offensive, to allow residents of the east to escape to the Assad's forces-held western districts. The U.N. estimates there are some 250,000 people in the oppsition-held areas."Nothing about what the regime said about corridors is real, nothing. How can we move on the streets if we don't feel safe. If it was real I would leave now," says Mustafa, a 48-year-old man who lives with his two elderly parents, his wife and daughter.Water stations have been badly damaged and humanitarian aid has not reached the rebel-held district in many weeks. One resident said people were eating mostly rice and lentils, which had been stockpiled, noting that there were few vegetables left. "I am now going to eat my last potato," Rami, an Aleppo resident, said over a social media application.The Syrian military announced late on Thursday it was launching a ground invasion of the eastern districts, though the actual offensive appeared to have been somewhat delayed. "The regime and the Russians are conducting heavy raids as a prelude for their ground attack," Rami Abdel Rahman, head of the monitoring group, told DPA news agency. Assad's forces have called on residents of the east to move to western districts.In a late night announcement on Thursday, the Assad's forces announced "the start of its operations in the eastern districts of Aleppo", and warned people to stay away from "the headquarters" of the opposition groups.Elaborating on this on Friday, a military source said the offensive would be a "comprehensive one", with a ground assault following air and artillery bombardment. "With respect to the air or artillery strikes, they may continue for some time," it said. There was no immediate comment from the Russian or Syrian forces detailing Friday's air strikes.Assad's forces declaration of the offensive coincided with international meetings on Syria in New York, the latest diplomatic efforts officially intended to revive the truce, which was brokered by the United States and Russia.Its collapse, the same fate as all previous efforts to halt a 5-1/2-year-old war that has killed hundreds of thousands of Syrians, has doomed what may be the final bid for a peace breakthrough before President Barack Obama leaves office.The U.S.-Russian agreement marked their second attempt this year to halt the war. It was supposed to bring about a nationwide ceasefire, improved humanitarian aid access, and a joint U.S.-Russian effort against DAESH.