Berlin - German prosecutors said Tuesday they were investigating two men of Tunisian origin suspected of planning to use model aircraft for terrorist attacks, as police in Germany and Belgium raided a series of sites to gather evidence of "possible attack plans and preparations."
No one was arrested in Tuesday's raids, which were carried out in the Stuttgart and Munich areas of southern Germany and in Saxony in eastern Germany, federal prosecutors said in a statement. One site in Belgium was raided.
Prosecutors said the investigation involved possible charges of "preparation of a serious, state-threatening act of violence," but not membership of or supporting any specific terrorist organization.
The two Tunisians are suspected of "procuring information and objects to commit Islamic extremist explosive attacks with remote-controlled model aircraft," prosecutors added. They gave no further information on the two men and didn't identify them.
However, the public broadcaster in southwestern Germany, SWF, quoted unnamed sources saying the two were studying aeronautics in Stuttgart and were suspected of trying to develop techniques for piloting model planes using GPS technology.
Among the locations raided were the apartments of four acquaintances of the two men who were suspected of financing Islamic extremism, officials said. The investigation also targets another acquaintance suspected of money laundering. None of the suspects was identified.
Last November a US man, Rezwan Ferdaus, was sentenced to 17 years in prison over a plot to fly remote-controlled model planes packed with explosives into the Pentagon and US Capitol.
Last year Spanish police released a video they claimed showed suspected al-Qaeda members training for a bombing raid using a model plane. Two Russians of Chechen origin were charged with possession of explosives but were released in April for lack of evidence.
A Turk living in Spain was also arrested but later released.
Germany has seen only one successful attack by an Islamic radical - the fatal shooting of two US airmen at Frankfurt airport in 2011 by a Kosovo native who grew up in Germany and became radicalised by watching jihadist propaganda on the internet.
However, there have been several attempted attacks in the country, which is a major contributor to international forces in Afghanistan.
Separately on Tuesday, French authorities said police detained six people in the Paris region on suspicion of plotting terrorist attacks in France.