DENVER (Reuters) - Colorado lawmakers passed a bill on Friday to mandate universal background checks for all gun buyers in a state that has experienced two of the deadliest mass shootings in U.S. history, a spokesman for Colorado House Democrats said.

The passage of the bill capped months of debate on gun control in Colorado, and came after legislators approved four other gun control measures on Wednesday. The state's governor, a Democrat, has already said he supports more stringent background checks.

(Reporting by Keith Coffman; Writing by Cynthia Johnston; Editing by Greg McCune)