The midnight earthquake on Saturday caused cracks in walls and led to the collapse of roofs of many buildings in the capital. The ceilings of two buildings of fourth-class employees of Dhaka Medical College Hospital (DMCH) at Elephant Road collapsed and walls developed cracks at many residential halls of Dhaka University after being jolted by the moderate earthquake. Meanwhile, authorities have identified some vulnerable city buildings and asked the dwellers of those to vacate the dilapidated structures immediately. A moderate tremor shook the capital and a large part of the country Saturday midnight. In the city following the tremor, the top floor of a four-storied building of fourth-class employees of DMCH at Elephant road collapsed at about 9:00pm on Sunday night. Earlier, during the tremor, the top floor of several other buildings in the area also collapsed. Around three to four thousand people of the staff quarters came hurriedly out of their residences under the open sky. The earthquake struck at a time when most of the city dwellers were asleep. The Director of DMCH Brig Gen Abdus Shahid Khan, rushed to the spot yesterday and asked residents to vacant the buildings immediately. But the authority did not take any steps to shift around 150 to 200 people of the buildings till filing of this report last night. Besides, the officials of Public Works Development (PWD) led by its Executive Engineer Arifur Rahman went to the place at 9:30am. After observation, he asked the residents of the quarters to leave the building within a short time. "The three buildings of the area are so vulnerable that another earthquake would spell disaster to the inhabitants," the executive engineer said. Meanwhile, our Dhaka University correspondent reports, the DU authorities have started to shift students of two vulnerable dormitories to safer places from yesterday. Under the process, more than one hundred resident students of Muhsin Hall will be shifted to the hall auditorium, university gymnasium and provost quarters of Shahidullah Hall and around fifty students of Rokeya Hall Honours Building will be shifted to the Fayzunnessa Chhatri Building of the Hall. The authorities also decided to shift as many as 400 students of Jagannath Hall East Building, to other four buildings of the Hall. Sources said the process would begin in a day or two. However, a report of the Bureau of Research Testing and Consultation (BRTC) of the Bangladesh Engineering and Technology (BUET) suggested the DU authorities to shift students from the vulnerable rooms immediately as Saturday's moderate earthquake developed cracks in many dormitories