Forty school children were killed when a train crashed with a bus south of Egypt's capital on Saturday, according to the official state news agency.
The train reportedly hit the school bus from the city of Manfalut, near Assiut.
The city's governor has ordered an enquiry into the incident.
More top news
The party's deputy-leader is the sole candidate in the race to succeed Gerry Adams.
A Met Office yellow "be aware" warning for ice is in place across much of Scotland, Northern Ireland and northern England.
Nick Boles warned the PM it was "time to raise your game" and claimed her government "constantly disappoints" in a tweet.