Superintendent of Police Narendra Kumar Singh said three persons involved in the attack on Tewari were arrested from Bhatti Mohala locality under Medininagar Town police station yesterday.
The arrested persons were identified as Manoj Kumar Choudhury, a para-teacher, Devendra Choudhury and Ravindra alias Parvinder Choudhury (all residents of Chainpur block in the district). A pistol and two live cartridges were recovered from their possession.
A motorcycle used in the attack has also been recovered and the vehicle was found to be stolen one, Singh said.
Altogether 10 persons - five each from Palamau and Garwah - were involved in the attack, Singh said adding that a special team has been formed to arrest the remaining accused.
Singh denied that the attack was the outcome of political rivalry, but executed by road robbers.
Tewari escaped unhurt when unidentified gunmen opened fire at his car near Anraj Ghati while he was going to Ranka from Garhwa to attend a wedding on Wednesday night last.