A man has gone on trial in Germany accused of abducting and killing two young boys last year, including a 4-year-old from Bosnia who was taken from Berlin's central migrant registration center.

The 33-year-old suspect, a security guard identified only as Silvio S. in line with German privacy rules, is charged with murder and sexual abuse.

Prosecutors have said that he confessed to kidnapping a 6-year-old German boy in Potsdam, outside Berlin, last July and later killing him. They say he also admitted to authorities that he abducted 4-year-old Mohamed Januzi in October, then sexually assaulted him and strangled him.

No formal pleas are entered in German trials. The suspect didn't immediately comment on the charges as his trial opened Tuesday at the Potsdam state court, news agency dpa reported.