Investigators claimed to have made a "significant discovery" during a search at one of the two houses of the German co-pilot who officials say appears to have deliberately crashed a plane into the French Alps, according to a report.
But officials refused to elaborate on the finding at the house in Dusseldorf in Germany, adding that it was not a suicide note, the report added.
"Both the home of the co-pilot in Duesseldorf and the home in Montabaur have been searched," chief public prosecutor Ralf Herrenbrueck said in Duesseldorf.
Andreas Lubitz, the 28-year-old co-pilot who French authorities believe deliberately brought down a Germanwings jet on Tuesday, lived with his parents in the western town of Montabaur, while also keeping a flat in Duesseldorf, Montabaur mayor Gabriele Wieland told DPA news agency.
Duesseldorf prosecutors have opened a parallel inquiry to the main investigation under way in France as many among the 150 crash victims were from the German region.
The city's public prosecutor said in a written statement that searches in Duesseldorf and other places were aimed at "in particular, the discovery and securing of personal documents" to help clarify the situation.
In Montabaur, a town of around 12,500 inhabitants, a police cordon had been set up around the Lubitz family home and men wearing gloves came out carrying briefcases, bags and boxes, an AFP journalist saw.
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