Nazareth singer Dan McCafferty was rushed to the hospital last Saturday (Aug. 24) after experiencing shortness of breath while performing in Switzerland. It’s since been determined the veteran vocalist suffered a stroke.

As reported by Classic Rock, the incident marks the second time in two months McCafferty has experienced breathing problems during a performance. The first incident occurred on July 9 in Cranbrook, Canada, when the singer collapsed just 30 seconds into the band’s opening song. An associate of the group told Classic Rock, “Dan is alright, but I think we will not see more [tour dates].”

McCafferty’s health woes come in the midst of sessions for Nazareth’s 24th studio album. A list of gigs on the band’s home page has been removed.