Saudi Arabia forced three Iranian boats to retreat from its waters on Thursday after firing warning shots, a spokesman for Saudi border guards said on Saturday. The spokesman said that the guards detected three Iranian vessels that had entered Saudi waters. They were repeatedly ordered to stop, but they refused to heed the warnings, he said, according to the Saudi Press Agency. The authorities were therefore, forced to fire warning shots in line with procedures, forcing the vessels to withdraw, he added. The border guards will not tolerate any violations in Saudi waters, he stressed.