A Michigan sheriff pledged Tuesday to review his department's guidelines for transporting suspects charged with violent crimes after an inmate who was cuffed in front rather than behind his back wrested a gun from a deputy and killed two court bailiffs.

Multiple people have reportedly been injured at the Berrien County courthouse in St. Joseph, Michigan about 130 kilometres south of Grand Rapids.

At least 26 people were injured after a Porsche 918 Spyder driven by British tycoon Paul Bailey slammed into a crowd of spectators at an auto show in Malta.