U.S. President Barack Obama has offered his condolences to the families and friends of those who were killed in last week’s massive fertilizer plant explosion in Texas.

Attending a memorial service at Baylor University in Waco, Texas, the U.S. president said people close to the victims are “grappling with unbearable loss,” but they are not alone and forgotten.

The explosion rocked the small town of West, Texas, killing 14 people and injuring 200 others on April 17th.