Updated

The head of a German parliamentary panel investigating a string of neo-Nazi murders says suspects in the case likely had more supporters than currently known.

Lawmaker Sebastian Edathy said Wednesday that the group calling itself National Socialist Underground couldn't have carried out a bombing, 10 murders and more than a dozen bank heists without a support network.

The crimes took place between 1998 and 2011, when two of the three core members of the group died in an apparent murder-suicide.

The surviving core member, Beate Zschaepe, and four alleged accomplices go on trial April 17.

Edathy's panel has received comprehensive access to still-classified material as it seeks to uncover why security services failed to stop the neo-Nazi cell for 13 years despite having informants close to the group.