In a statement the King and Queen said they were “desperately shocked by the terrible events in Ahmedabad this morning”.
“Our special prayers and deepest possible sympathy are with the families and friends of all those affected by this appallingly tragic incident across so many nations, as they await news of their loved ones,” the statement added.
Meanwhile, UK Foreign Secretary David Lammy has arranged crisis teams in India and the UK.
He told the Commons: “We know that British nationals were on board and I can confirm that the FCDO (Foreign, Commonwealth and Development Office) is working urgently with local authorities to support British nationals and their families, and has stood up a crisis team in both Delhi and in London.”