A bottling plant in Hajjah province is hit as Amnesty International warns of a "bloody trail of civilian death" in Yemen.
Issa Ahmed, a resident in Hajjah province, told the Reuters news agency the bottling plant was hit on Sunday morning.
He said: "The process of recovering bodies is finished now.
"The corpses of 36 workers, many of them burnt or in pieces, were pulled out after an airstrike hit the plant this morning."
On Friday, air raids killed 65 people in Taiz - most of them civilians - and last month 65 people including 10 children were killed after a milk factory was hit in western Yemen.
Human rights group Amnesty International said earlier this month that the Saudi-led campaign has left a "bloody trail of civilian death", which could amount to war crimes.
More than 4,300 people have been killed in five months of conflict in Yemen.