Sen. Bernie Sanders is recovering after having heart stents installed, canceling his presidential campaign events until further notice.

Jeff Weaver, a senior adviser to the Democratic presidential campaign of the Vermont independent, made the announcement of the medical procedure.

“During a campaign event yesterday evening, Sen. Sanders experienced some chest discomfort. Following medical evaluation and testing he was found to have a blockage in one artery and two stents were successfully inserted. Sen. Sanders is conversing and in good spirits. He will be resting up over the next few days,” Weaver said. “We are canceling his events and appearances until further notice, and we will continue to provide appropriate updates.”

Sanders was among the 10 Democratic presidential hopefuls scheduled to appear at a candidate forum in Las Vegas on Wednesday. The event is being hosted by Giffords and the March for Our Lives, two groups advocating for new gun safety laws.

The event, hosted in conjunction with MSNBC, coincides with the two-year anniversary of the mass shooting at a Las Vegas music festival.