On January 17, Mohd Shahzada, who was travelling in a DTC bus found a man trying to steal his mobile phone from his pocket, he said.
With the help of another passenger Ram Kumar, he caught the pickpocket and decided to hand over the accused- Mohd Fahim to police, said the officer.
As they deboarded the bus, Fahim attacked them with a knife and fled.
Injured Shahzada and Kumar were taken to AIIMS, he said.
A team was formed to track the accused and he was arrested from northeast Delhi's Nand Nagri area said Romil Baaniya, DCP(Southeast).
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