updated 5/3/2009 3:31:39 PM ET 2009-05-03T19:31:39

Police in Vienna arrested a man suspected of slipping drugs into drinks at a crowded bar Sunday, causing five people to collapse. Authorities said all five victims were hospitalized in life-threatening condition.

Investigators said they were still trying to determine a motive for the attack, which happened on a sunny afternoon at a small bar packed with up to 50 people enjoying an "after hours" party.

Authorities were called to the scene when customers at a sidewalk ice cream salon across the street from the bar saw the five victims fall to the ground.

"We got an emergency call at 5 p.m.," said police spokeswoman Iris Seper.

She said officers later took the unidentified suspect into custody after witnesses said they had seen a man offering the victims drinks.

Investigators said it was unclear exactly what substance had been added to the drinks, but that it appeared to be some kind of narcotic. Seper said the victims drank freely, apparently unaware that anything was amiss.

The five — three men and two women, all in their 20s — were taken to several hospitals around Vienna, Seper said.

Police would not say whether the suspect was employed at the bar in Vienna's central Alsergrund district or had any other connection to the establishment.

It also was unclear whether the five victims knew each other and whether their attacker had singled them out or targeted them.

The bar where Sunday's attack took place is one of dozens of cafes, taverns and restaurants nestled in the Stadtbahnboegen — arched spaces beneath elevated tramway trestles.

The neighborhood is situated on the Guertel, a main thoroughfare ringing the Austrian capital.

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 This material may not be published, broadcast, rewritten or redistributed.

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