Commemorating the catastrophic Halifax Explosion 100 years ago

Sombre ceremonies will be held across Halifax today, marking 100 years since the city was devastated by a wartime blast that killed or injured about 11,000 people.
    
The Halifax Explosion, was caused by the collision of two ships in the harbour,  remains the worst human-made disaster in Canadian history.
    
 A main commemoration ceremony will be held this morning in Fort Needham Memorial Park,  not far from the spot in Halifax harbour where the French munitions ship SS Mont-Blanc blew up, levelling much of the city's north end.
    
Other events include a public reception, author readings, a children's play, a special ceremony for firefighters killed by the blast, and at least six commemorative concerts.