Tripoli, Libya (CNN) -- Despite five days of coalition airstrikes, troops loyal to Libyan leader Moammar Gadhafi continued Wednesday to terrorize residents of the besieged rebel-held city of Misrata.

One witness said Gadhafi's forces had attacked the city's main hospital, where 400 people -- about half of them patients -- were located. The push began at 8 p.m. (2 p.m. ET), when "heavy tanks for Gadhafi troops start attacking the hospital -- the bombs falling here 20 meters (66 feet) around us," said one person inside the hospital. He said two deaths had occurred "around the hospital."

At one point, shelling occurred without respite for 40 minutes, he said. "Now, fortunately, no more shelling, but the situation is so serious that all the teams here -- the doctors, the patients -- are paralyzed, scared."

He called for international intervention to protect the civilians inside the institution. "Nobody can work here," he said. Ambulances were not able to leave the hospital, which had lost its electricity and was using generator power, he said.

During the last day, the international coalition has flown 175 sorties over Libya -- 113 of them by U.S. planes and the remainder from other nations participating in the U.N.-backed mission, U.S. Navy Rear Adm. Gerard Hueber told reporters Wednesday.

bad news becaus gaddafi its killing people mor in that hospital