Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.

BERLIN — The families of passengers killed in the Germanwings crash will take legal action against Lufthansa in the United States after rejecting the carrier's compensation offer as inadequate, according to a German newspaper, citing the families' lawyer.

Germanwings, a unit of Lufthansa, in June offered 25,000 euros ($27,500) per victim for the pain and suffering caused by the March 24 crash that killed all 150 onboard.

The 25,000-euro offer is on top of 50,000 euros per passenger already paid as immediate financial assistance to relatives.

Let our news meet your inbox. The news and stories that matters, delivered weekday mornings. This site is protected by recaptcha

United States law provides for large payouts for emotional damages, unlike German law. A low six-digit amount would be adequate compensation, Elmar Giemulla, a lawyer representing some of the victims said last month.

Three Americans died in the crash into the French Alps.

"We are preparing a lawsuit in the United States and see good chances for a place of jurisdiction there," newspaper Bild am Sonntag quoted Giemulla as saying. Damage claims have not been set yet but plaintiffs will follow American law, Giemulla said.

Related: Germanwings Crash: Pilots Should Face Mental Health Tests, Experts Say

Planned legal action will aim to find out why co-pilot Andreas Lubitz, who had previously suffered from depression, was allowed to fly, Giemulla said.

Giemulla did not return calls seeking comment.

Evidence shows Lubitz locked the captain out of the cockpit of Germanwings flight 4U9525 from Barcelona to Duesseldorf and deliberately steered the plane into a remote mountainside.

Giemulla will cooperate with New York-based law firm Kreindler & Kreindler, the newspaper said.