updated 9/20/2009 2:23:08 PM ET 2009-09-20T18:23:08

A doctor leading a group therapy session gave participants drugs and other substances that killed two and hospitalized 10, Berlin police said Sunday. One person was left comatose and in critical condition.

The doctor who led the session has admitted giving the participants various substances and drugs during the meeting, Martin Steltner, a spokesman for the Berlin prosecutor's office, told The Associated Press on Sunday. It was not clear whether illegal drugs were given and whether the substances were injected or taken orally.

A police statement said autopsies have been carried out on the two dead people but "the chemical-toxicological investigation will take a while."

Police said the session took place in a house and medical practice in the leafy Hermsdorf neighborhood in the north of Berlin. The 50-year-old doctor who worked there was detained and a homicide division was investigating the case, police said.

Symptoms of nausea and vomiting
The doctor, his 41-year-old wife, who runs a practice for alternative medicine in the same building, and 12 persons attended the session on Saturday, according to a police statement.

"During the session, which lasted several hours, he supposedly gave the patients various kinds of substance and drugs which initially led to reactions like nausea and vomiting," the statement said.

When the symptoms got worse, one of the participants called the emergency services, according to the statement.

When police and ambulance cars arrived at the doctor's practice, they discovered twelve people who appeared to have been severely poisoned, it said.

On Sunday afternoon, nine other people were released from the hospital. One patient was still in critical condition.

On the Internet, the doctor identifies himself as a psychotherapist for individuals and groups. He specializes in "depth psychology, bodywork and art therapy, and spiritual crises," according to the Web site.

Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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