BERLIN - German police raided the homes and shops of four people suspected of supplying guns and explosives to a neo-Nazi gang of killers on Wednesday. Police gave no word of arrests, but Federal Prosecutor General Harald Range said the four new suspects increased the list of suspected supporters of the self-styled National Socialist Underground (NSU ) to 11.

All 11 are believed to have quietly aided the trio of neo-Nazis who adopted fake identities in a seven-year killing spree of immigrants between 2000 and 2007. The victims included eight Turkish shopkeepers, a Greek and a German policewoman.

The killings remained unsolved until the gang imploded two months ago after a failed bank raid, with a joint suicide by two, and with the survivor turning herself in. Most of the suspects are free or on bail. The survivor, Beate Zschaepe, 36, and four of the alleged supporters remain in custody.

"One of our most urgent tasks is to identify the complete circle of supporters and bring them to justice," Range said.

The raids were conducted by 110 police in three states.

Two of the new suspects are thought to have supplied an explosive and a gun to the group in 1998, and two others are believed to have provided guns in 2002 and 2003.

Their names were not released, but the daily Westdeutsche Allgemeine Zeitung said one of the suspects had actively helped the trio from 1999 and 2000 before quarrelling with them.

There are plans for a national commemoration of the victims next month.