The persons entered the office in Mailardevpally area at around 10 am, brandished knives and guns and started threatening the cashier and other staff, they said.
After the staff raised a hue and cry and switched on the burglary alarm, members of the public rushed to their rescue. Noticing a large number of people gathering at the office, the robbers lost their nerve and fled the scene, said Mailardevpally Police Station Inspector P Jagadeeshwar.
The police have formed special teams to nab the robbers.
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