WASHINGTON, April 19 (Reuters) - U.S. President Barack Obama plans to attend a memorial service on Sunday for the 29 coal miners killed in a West Virginia mine blast, the White House said on Monday.

The April 5 disaster at Massey Energy's MEE.N Upper Big Branch mine was the deadliest U.S. mine accident in nearly 40 years.

Obama is to deliver a eulogy in honor of those who died. The service will be held in Beckley, West Virginia.

The president last week accused Massey Energy, the largest coal producer in the Central Appalachia mountain region, of having “put their bottom line before the safety of their workers.” Massey Energy has rejected suggestions that the explosion was due to a disregard for safety.

Obama called for better mine oversight nationwide.