The four men were accused of carrying out attacks in Qatif region, where Shia groups have clashed with security forces.
A Saudi soldier has been killed and another injured in a shooting attack on their patrol vehicle in the kingdom’s eastern province of Qatif.
Saudi Arabia‘s official news agency on Friday quoted the Saudi interior ministry as saying that the attack took place late on Thursday. It gave no further details, but said that authorities were investigating.
In recent months, Qatif, a Shia-majority province, has seen a series of attacks targeting security forces.
Last week, two security personnel were injured when a roadside bomb hit their car in Qatif.
The interior ministry said the four were executed for incidents that took place in Qatif.