The robbers had attacked the house of Nand Kishore Agrawal, a leading jute trader, in Gola locality of the district. His servants raised an alarm after the watchman was stabbed, Superintendent of Police, Purnea, Vishal Sharma, who is holding the additional charge of Kishanganj, said.
Four of the robbers have been caught and many crude bombs and country made weapons recovered from the spot, Sharma said.
As many as 10 accomplices of the robbers managed to flee and raids were being conducted to nab them, the SP said.
The injured watchman has been admitted to a hospital, he added.
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