The order to kill journalist Rajdeo Ranjan, the police say, was issued from Siwan jail.
Ranjan was one of the 23 people named in the 'death warrant list' issued in 2007. Seven of them have been killed so far.
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Bihar Director General of Police P K Thakur on Monday said that the ongoing investigation into the killing of a senior journalist in Siwan district had suggested that a 'supari' (contract) had been given to kill him.
Siwan Superintendent of Police told ANI that the two are being grilled to procure more details regarding the shocking murder.
Bihar Police Additional Director General Sunil Kumar had earlier said that the five men were engaged by contract killer Mian, known to be close to Shahabuddin.
Prime suspect Mohammed Kaif is in judicial custody after he surrendered in a Siwan court on September 21.
He was medically examined then shifted him to jail number 2, whose other notable inmates include gangster Chhota Rajan.
His name has cropped up as an accused in journalist Rajdeo Ranjan murder case.
CBI sources said a team will soon leave for Siwan after a case is registered by it in the murder of Ranjan.
Nitish Kumar had a week's time to prove his majority, but Laloo Yadav made full use of Siwan don Mohammad Shahabuddin. A revealing excerpt from Rajesh Singh's Baahubalis Of Indian Politics: From Bullet To Ballot.
The widow of Rajdeo Ranjan, the journalist who was gunned down, has said the killers had a connection with someone in jail.
A man, who had allegedly called up the Lok Sabha Secretariat on Monday and threatened to blow up Parliament building, was taken into custody in Bihar's Siwan district.
Five persons were killed and eight injured when an auto rickshaw carrying students and a pick up van collided in Bihar's Siwan district, triggering violence in the area with locals ransacking a hospital and torching vehicles.
On the road rage incident in Gaya, Kumar said, "... when I saw in the media the (journalist's) family's demand for a CBI probe, I personally asked the DGP (director general of police) to send a police team to acquaint the family with probe (being conducted by the state police).
Rajdeo, who was the Siwan bureau chief of the newspaper, was shot dead on May 13 at a busy fruit market near Siwan railway station.
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Three persons, including Upendra Singh, a history sheeter allegedly linked to the Rashtriya Janata Dal strongman and former Lok Sabha MP from Siwan Mohammed Shahabuddin have been detained but no arrests have been made so far.
A senior journalist of Hindi daily Hindustan was shot dead in Bihar's Siwan district on Friday nigth by unidentified gunmen, police said.
Ex-RJD MP has been charged with murder and criminal conspiracy in the killing of journalist Rajdeo Ranjan.
The much-hyped liquor ban in the state has been widely seen as a failed attempt five years after its introduction.
The former RJD leader was released on bail in the Rajiv Roshan murder case after 11 years, reports M I Khan.
'I have nothing more to lose. My three sons were killed. I am not going to sit silent.'
Ranjan was shot dead by criminals near the Siwan railway station on Friday.
Ramadhar Singh, the jailor of Siwan jail where Shahabuddin is currently lodged, has filed an FIR against Shahabuddin for abusing, misbehaving and threatening him.
According to Singh, four youths entered in his office and wanted to know that who had written the news about man arrested for intimidating voters during Panchayat elections a few days ago.
For the moment, Siwan is once again Shahabuddin's home.
RJD MP Mohammed Shahabuddin arrested in Delhi
The court said that after casting his vote, he would be immediately taken back to Siwan jail.
Mohammad Shahabuddin, in prison for over a decade, still inspires fear, a reminder of the 'jungle raj' when political murders were commonplace in Bihar.
He said the Special Auxiliary Police were directed to keep a close watch on the jail.
Justice Shivakirti Singh granted regular bail to the controversial Lok Sabha member from Siwan in connection with the case registered at Hussainganj police station in Siwan district against him in 2001 for illegally possessing sophisticated firearms. Shahabuddin will, however, not be released as he is serving life sentence for abducting and murdering a CPI-ML activist Chotelal Gupta on May 7, 1999.
A case of violation of the jail manual has been lodged against the RJD MP.
Bihar Chief Electoral Officer H R Srinivasa said the Election Commission has established a three-tier security system for strong rooms (housing the electronic voting machines) and the counting centres. The inner core is being guarded by the Central Armed Police Forces (CAPFs), then there is the Bihar Military Police (BMP) and then the district police, he told reporters.
The death of a suspected thief, Govind Rajbhar, in police custody early Friday in Siwan district has angered people in Bihar. Rajbhar is alleged to have been beaten and tortured by the police.