Failed robbery attempt

Four unidentified persons today tried to rob a finance firm which lends money on gold mortgage in KPHB area here, police said.
The culprits entered the firm and asked the staff to hand over key to the strong room. One of them was carrying a revolver.
However they took to heels when some customers came in, police said.
"They took away hard-disk of CCTV camera," a police officer said. Further probe is on.