Ali Agrairees and Muneeb Aladnan who killed by Saudi security forces Wednesday evening
Two people have been killed and three wounded by Saudi security forces in Qatif last night.
It broke out during the funeral of two people killed this week and raises the death toll to four in Eastern Province since Sunday.
An activist said: "Everything was fine until the body arrived, then the people got very angry and started to chant anti-government slogans and the riot police shot in the air."
"People came back onto the streets after evening prayer and the riot police started shooting at them directly. I could hear shooting from 8 p.m. until midnight."
The government has implied that protests supported by members of the Shi'ite Muslim minority and attacks on police stations and checkpoints were instigated by its rival Iran.
Activists say they started after police at a checkpoint shot a young man on Friday, which the government denies.