A group of expatriate Iraqi Kurds have dropped their federal court claim that Thermo Fisher Scientific Inc. sold chemical-weapons materials to the Saddam Hussein regime in the 1980s.

The Nashville-based Kurdish National Congress and five expatriates filed the dismissal notice Friday in U.S. District Court in Baltimore.

Thermo Scientific is based in Waltham, Mass.

The action leaves just one defendant — Alcolac Inc., a unit of the Paris-based Rhodia group.

Alcolac is seeking dismissal of the lawsuit.