CBI arrested BJP MP Dinu Bogha Solanki in the murder case of RTI activist Amit Jethwa who had waged a crusade against illegal mining in Gir Forest in Gujarat, the last home of Asiatic lions.
BSP MP Dhananjay Singh and his wife Jagriti were arrested after their 35-year-old maid was found dead and another minor domestic help was "tortured" with stick and rods.
Solanki, Lok Sabha member from Junagarh, was questioned at the CBI headquarters here throughout the day, after which the agency placed him under arrest.
"He will be produced in a Delhi court tomorrow. Probe in the case is in progress", he added.
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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.
Police sources said both Dhananjay and Jagriti were arrested for their alleged involvement in the case.
Jagriti was taken into custody this morning and questioned for 12 hours, investigators said.
An FIR was registered against her at Chankyapuri police station under sections 302 (murder), 307 (attempt to murder), 344 (wrongful confinement) of Indian Penal code and Juvenile Justice Act. Police are mulling to add sections under Bonded Labour Act for hiring a juvenile.
They said the injury marks were visible on arms, legs and chest. Police also questioned Dhananjay to ascertain his role in the case.
Another minor help, who has been working at the household for the last one year, told police that he was also beaten up badly by Jagriti.
Dhananjay told police that he was away in his constituency Jaunpur in Uttar Pradesh and reached Delhi only in the evening and subsequently informed police, said investigators.