Riyadh: Four armed men set a bus on fire on Tuesday carrying workers in Saudi Arabia's oil-producing Eastern Province, state news agency SPA reported.
The bus was carrying 49 employees of Aramco to their office.
Eastern region police media spokesperson said that four rioters forced the driver to stop the bus at gunpoint and set fire to the vehicle, reported Arabic daily Sabq.
State oil company Saudi Aramco said none of its employees had been injured but gave no further details.
Security forces intervened and extinguished the fire, reporting no casualties among the passengers. Meanwhile, police launched a manhunt to track down the terrorists and bring them to justice.
SPA said the men had stopped the bus in the district of Qatif, the home of prominent cleric Nimr al-Nimr, who was executed on Saturday with 46 other men.
Nimr's execution has angered minority across the Middle East and caused a major diplomatic row between mainly Iran and Saudi Arabia's conservative monarchy.