Tributes are being paid today to the four men who died in the Gleision mining disaster. It's exactly year since the tragedy in the Swansea Valley which shocked Wales and the world.
Some of the victims' families have been attending private remembrance events while the Welsh public and politicians have been paying their respects.
Nicola Hendy reports.
Our thoughts and prayers are with the loved ones of the 4 brave men who tragically lost their lives at the #Gleision mine a year ago today
Exactly 12months ago I started getting calls about an incident in Swansea Valley - never dreamt it would become the heartbreak of #Gleision
A year today, unbelievable. Rest in peace men of gleision. Mines rescue service 1912-2012. Let's have another 100! http://t.co/UsTlpcIM
Tomorrow marks a year since the Gleision Colliery disaster in which four men died.
First Minister Carwyn Jones says lessons must be learned to make sure an incident like it doesn't happen again.