Jakarta. Four police officers and two civilians were arrested by the Jakarta Police last week for kidnapping a British national and demanding a ransom from his business partner, a police spokesman said on Thursday.

Matthew Simon Craib was kidnapped early in the morning on Oct. 30 on his way home from a business meeting.

The kidnappers demanded a ransom of $1 million from Craib's supervisor, identified by the police as P., who told the kidnappers he was only willing to give them $900,000.

Police arrested the kidnappers in Kemayoran, Central Jakarta, later in the day when they were about to pick up their ransom, Jakarta Police spokesman Chief Comr. Argo Yuwono said.

The four police officers, all identified by their initials – policewoman N.P.U. and policemen Brigadier J.J.B., Brigadier H. and Brigadier S.B.S. – are now being detained at the Jakarta Police headquarters.

The two civilians involved in the kidnapping have been identified as G. and his girlfriend N.A.

Police said G. was a co-worker of Craib. He had planned the kidnapping with his girlfriend, who contacted Brigadier J.J.B. from the police's cybercrime unit to join in on the plan.

J.J.B. then asked his girlfriend, Brigadier N.P.U., an officer from East Jakarta Police's anti-drug squad, who in turn asked her colleagues Brigadier H. and Brigadier S.B.S. to help them.

J.J.B.'s role in the kidnapping was to tail Craib and update the other kidnappers on his whereabouts.

Craib's car was ambushed by N.P.U., H. and S.B.S. on the Jakarta Outer Ring Road in Tangerang, Banten.

Police started searching for Craib after receiving a report from his friend that the businessman never arrived home after his meeting on Oct. 29.

The kidnappers face a maximum jail sentence of 15 years if found guilty.