Janet Jackson was released from a Montreal hospital just two hours after she arrived, a spokeswoman for the facility said yesterday (Sept. 30), but it was still not clear why she was admitted.

The 42-year-old singer became "suddenly ill" and was taken to Royal Victoria Hospital on Monday night shortly before her scheduled concert in Montreal, which was canceled, according to a statement released by W&W Public Relations.

Jackson was at Royal Victoria but was released two hours later, said Rebecca Burns, representative for McGill University Health Centre, which runs the hospital. Representatives for Jackson would not elaborate on her condition, simply saying that she was ill and was "recuperating."

Meanwhile, Jackson's shows in Boston tonight and Philadelphia tomorrow were postponed, with dates to be announced. She was due to resume her tour in Greensboro, N.C. on Saturday.