WASHINGTON — Last year's fatal accident at the Crandall Canyon Mine in Utah has prompted the Mine Safety and Health Administration to refocus on mine-roof safety.

MSHA this week launched the Preventive Roof/Rib Outreach Program, which will "highlight the potential hazards of roof falls and coal outbursts," according to the agency.

More roof falls at mines happen in the summer than during the rest of the year, as warm air carries moisture into the mines. If the roof absorbs the moisture, it can weaken and fall.

MSHA inspectors plan to talk to miners and operators about roof falls during their inspections this summer, as well as provide extra information on roof safety guidelines and rib controls.

The Crandall Canyon accident killed six miners, and three rescuers died days later. MSHA is in the midst of finalizing its investigation into the accident.