Federal prosecutors say the man was detained on Thursday in the central state of Hesse.
Prosecutors said in a statement that the suspect, identified only as Abduqaadir A. in line with German privacy laws, is suspected of attempted murder and accessory to murder.
He is alleged to have joined al-Shabab in Somalia in 2012, undergone weapons training and then taken part in the killing of a person at a mosque.
The suspect is alleged to have later attempted to kill a member of the Somali government, who survived the attack.
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