11.   Police and Federal Security Service forces were brought to the plant to investigate the explosions, it added.

12.   Police are investigating the explosion, he said, adding that experts from Prague also have been invited to assist the investigation.

13.   Police said they were still investigating the explosions and the cause has not yet been determined.

14.   Police said they would investigate the explosion.

15.   Police were still investigating the explosions.

16.   Police in Berlin said late Saturday they were investigating an explosion at the entrance to a Jewish cemetery in the city.

17.   Police said they were investigating the explosion in Bukker.

18.   A government commission was investigating the explosion and helping the victims.

19.   A special commission is investigating the explosion.