The Israeli army on Thursday jailed one soldier and sanctioned two others after they were filmed apparently dropping a stun grenade alongside a group of seated Palestinians.

A video posted online Tuesday showed an army jeep pulling up next to the men, sitting at the roadside and smoking a water pipe in the northern West Bank village of Kafr Laqif.

As the jeep pulls away a flash and smoke can be seen in the road and the men scatter, apparently unharmed.

An army statement on Thursday referred to an investigation launched into an "incident in Kafr Laqif" but did not give details.

"The investigation revealed that the platoon sergeant acted contrary to Israel Defense Forces standards," it said.

"The platoon sergeant and two additional soldiers present in the vehicle were sentenced in disciplinary proceedings by the battalion commander. The platoon sergeant was sentenced to military jail."

It is unclear so far as to what what the motive for throwing the stun grenade was.