Polish authorities have arrested a suspected Israeli agent in connection with the murder of a Hamas operative in Dubai in January.
Officials say the agent was arrested in early June. Media reports named him as Uri Brodsky.
Germany is seeking his extradition over a forged German passport used by one of the killers, the prosecutors say.
Mahmoud al-Mabhouh, one of the founders of Hamas’s military wing, was found dead in a Dubai hotel on 20 January.
Dubai police have said they are 99% sure Israeli agents were involved, but Israel says there is no proof.