Mumbai: Madhya Pradesh Police have arrested Sadhvi Pragya Singh Thakur in connection with the murder of Sunil Joshi, a suspect in the Samjhauta Express blast case. Sadhvi is a key accused in 2008 Malegaon blast case in Maharashtra.

"The MP police moved an application in the special Maharashtra Control of Organised Crime Act (MCOCA) court here, and after taking the court's permission they placed Sadhvi under arrest in the Sunil Joshi murder case," Special Public Prosecutor Rohini Salian said.

Pragya Singh has been undergoing treatment in J J hospital.

"It is just a formal arrest. She would be taken to MP after they make transportation arrangements," Pragya's lawyer advocate Ganesh Sovani said.

Joshi, a suspect in the Samjhauta Express blast case, was shot dead in Dewas in Madhya Pradesh on December 29, 2007.

Pragya, an alleged member of right-wing Hindu group Abhinav Bharat, has already moved the Supreme Court challenging her prosecution under the MCOCA in the Malegaon blast case.

The Bombay High Court had earlier reversed special court's order quashing application of MCOCA against her in the blast case, following which she filed appeal in the apex court.

Six people were killed and many were wounded in the bomb blast in the communally sensitive town of Malegaon, in Nashik district, on September 29, 2008.

Maharashtra Anti Terrorism Squad has so far arrested 12 persons in Malegaon case.