BERLIN (Reuters) - Around a dozen people were missing on Tuesday after a Berlin apartment block collapsed following an explosion, German rescue workers said. Six people were pulled alive from the rubble and police said nine residents were now known to be in safety. Rescue workers at the scene of the blast in the western district of Steglitz said up to 14 people were still missing. A spokesman for firefighters, however, put the figure at 10. Police said rescue workers could see one man alive under the rubble and were in the process of freeing him. There was no immediate word on the survivor‘s condition. Witnesses said the building, which was several floorss high, collapsed after an explosion in the early hours of the morning. „There was a huge explosion and I thought my last hour had come,“ neighbour Uwe Westphal told Berlin radio from the scene of the accident. The cause of the blast was not yet known but a gas explosion was one possibility, a police spokesman said. Around 100 rescue workers combed the scene of the blast, using dogs to try to locate people buried in the rubble.