Two more detained over arson attack on Czech defence factory

PRAGUE, April 4 (Reuters) - Authorities detained two more people in connection with the arson attack on a Czech optics and drone factory last month, Czech police and a public prosecutor's office said on Saturday.A previously unknown pro-Palestinian activist group has claimed responsibility for the March 20 fire at an industrial complex in Pardubice, about 120 km (75 miles) east of Prague.Czech authorities have previously announced five detentions, including of an Egyptian and a U.S.