FOD, it's not just snowballs ...

Sources had previously told The War Zone that the incident occurred when a tablet computer was ingested in one of the engines, which caused substantial damage, necessitating the replacement of both engines on one side of the aircraft. The 7th Bomb Wing would neither confirm nor deny any of these specific details.

https://www.thedrive.com/the-war-zone/40209/a-b-1b-bomber-suffered-significant-engine-damage-while-deployed-to-norway