Deputy Inspector General (Eastern Range) Donkupar K Rapthap allegedly tried to speed away after his vehicle hit 20-year-old Baiahun Khongwir at Jaiaw here last evening, the police said.
The DIG's vehicle almost rammed into two other vehicles while speeding off, eye witnesses said.
Angry people chased and caught Rapthap's vehicle a kilometer away, the police said.
Senior police officers rushed to the spot and escorted him to the police headquarters, sources said.
Officials said no action has been taken against Rapthap.
The girl was seriously injured and is recovering in the ICU of a local hospital.