Buckingham Palace: Queen Elizabeth under medical supervision

Buckingham Palace says Queen Elizabeth is under medical supervision as her doctors are concerned for her health.

The palace issued a statement on Thursday that says the doctors recommended she remain under the supervision following "further evaluation" in the morning.

The statement says the Queen "remains comfortable" at Balmoral Castle in Scotland.

The Queen's eldest son Prince Charles and his wife, Camilla, have reportedly arrived at the castle, and her grandson Prince William is on his way.