Mexico City police have arrested the former head of the country's anti-money-laundering office on suspicion of extortion.

Mexico City chief prosecutor Rodolfo Rios says Jose Luis Marmolejo was arrested over the weekend.

Rios said late Tuesday that he did not have details of the charges, but local media say Marmolejo is accused of demanding money from a local businessman in return for clearing up a spurious legal case. He does not appear to have been formally charged yet and there was not attorney of record.

Marmolejo served in the federal attorney general's organized crime and money laundering offices in the mid-2000s.

A number of former prosecution officials in Mexico have been arrested on charges of corruption or aiding drug traffickers, but some have since been released.