German intelligence operatives involved in murders?

According to the magazine "Stern" this may be the case:
Murder of Heilbronner policewomen
Were German intelligence operatives ("Verfassungsschutz") present at
the murder of Michele Kiesewetter?
Records of the U.S. military intelligence, suggest that intelligence
authorities were nearby, when a policewoman in Heilbronn was murdered
allegedly by the Zwickau neo-Nazi gang that were possibly working for
the German intelligence services.

Officials at the scene of the crime scene: the U.S. military
intelligence documents indicate that intelligence authorities may have
been at the time of the murder of the Theresienwiese. The
"Verfassungsschutz" may have been near the crime scene, as shot four
years ago in Heilbronn on the Theresienwiese a policewoman and her
colleague was seriously injured. The Star reported on Thursday in its
latest edition of a secret surveillance report from an American Secret
Service.

Under surveillance, according to the Protocol on Apr 25, 2007, a
special unit of the U.S. Military Intelligence Agency, the "SIT
Stuttgart" (Special Investigation Team) two persons in a bank in the
city of Heilbronn "2.3 Mil. EURO (S)" deposits ("Deposited"). Have
been on the observation according to the U.S. domestic intelligence
report will also include two from Baden-Wuerttemberg and Bavaria ("BW
LFV OR BAVARIA") involved.

about the intelligence report from the U.S. in the new star
After leaving the bank, the two target persons went to the
Theresienwiese. There was the observation aborted because of a
"firearms incident", was implicated in the per protocol and an officer
from Baden-Wuerttemberg. Literally it says in the report of the
Americans: "SHOOTING INCIDENT involving BW OPS OFFICER WITH RIGHT WING
OPERATIONAL AND REGULAR POLICE PATROL ON THE SCENE". ("Shooting in the
BW Ops officer had been involved with the extreme right and regular
police patrols on site.")

When it was under observation the Mevlüt K. and an unidentified
companion closer. The German Turk K. originates from Ludwigshafen and
had planned to findings of the Federal 2007 contact with the Islamist
"Sauerland Group," the terrorist attacks on U.S. facilities in
Germany. Mevlüt K. procured the terrorists planned 26 detonators for
the bombs.

Now why would "Neonazis" be presented, when Islamists do a transaction
like that? Could it be that the intelligence services make use of
people posing as right wingers to do their dirty work?