PRAGUE, March 24 (Reuters) – Czech and Slovak police have detained three people, including U.S. and Czech citizens, following an arson attack on an arms producer’s facility claimed by a group that says the company develops weapons in cooperation with an Israeli firm.

Two of the suspects from Friday’s attack were detained in the Czech Republic and one in Slovakia, Czech police said on X on Tuesday.

“We continue to work intensively to apprehend the remaining suspects, also in cooperation with foreign partners,” the police said.

The fire damaged a building used by Czech defence group LPP Holding at an industrial complex in Pardubice, about 120 km (75 miles) east of the capital Prague.

LPP Holding announced plans to cooperate with Israeli group Elbit Systems in 2023, but says those plans have not been carried out.

LPP production includes drones that are exported to Ukraine, which has been fighting Russian forces since Moscow’s 2022 invasion.

LPP said police were looking at a possible Russian link in the arson attack. Police have not publicly commented on a possible Russia link but have said they are looking at different scenarios in their investigation.

Russia has denied previous accusations that it has carried out hybrid attacks in European Union countries.

The group that said it was behind Friday’s fire posted a statement on its website on Tuesday, saying it had taken “restricted documents” which it would publish if LPP did not cut ties to Elbit Systems and “denounce the barbaric occupation of Palestine”.

Israel launched a military offensive against Hamas in the Gaza Strip after the Palestinian militant group attacked communities in southern Israel in October 2023.

(Reporting by Jan Lopatka and Jason Hovet, Editing by Timothy Heritage)