Singer Janet Jackson has been forced to postpone two concert dates this week due to illness. reports that the announcement by her representatives comes a day after the singer suddenly fell ill during a sound check in Montreal on her Rock Witchu Tour.

The singer was rushed to hospital but was released a few hours later. It has not been revealed what the nature of her illness is.

The two postponed dates were set for tonight in Boston and tomorrow in Philadeplhia. Currently she is set to resume her tour on Saturday night.