Solanki, Lok Sabha member from Junagarh, Gujarat, arrived at the CBI headquarters this morning and was questioned throught the day, after which a CBI team decided to place him under arrest.

CBI spokesperson Kanchan Prasad said "the Lok Sabha MP from Junagadh has been taken into custody in the case of murder of RTI activist Amit Jethwa.

"He will be produced in a Delhi court tomorrow. Probe in the case is in progress", he added.

CBI sources said the parliamentarian was unable to give satisfactory answers after which it was decided to place him under arrest.

Gujarat Police had arrested six persons, including Shiva Solanki, nephew of the BJP MP, and sharp shooter Sailesh Pandya who had shot at Jethwa outside the Gujarat High Court. All of them were questioned by CBI inside a jail after taking permission from the designated court.

Jethwa was an RTI and environment activist who had filed numerous RTI applications and a PIL against illegal mining in Gir forest region. He was shot dead on July 20, 2010.

The MP was confronted with the statements given by other arrested accused in the case.

The BJP MP had been given a clean chit by Crime Branch of Gujarat Police prompting the father of the deceased to approach the Gujarat High Court.