Leto reportedly finished the show before heading to a local hospital for treatment.
In related news, 30 Seconds to Mars announced Friday (3/2) that bassist Matt Wachter had left the band to "spend more time with his family at home."
"We love and support him completely and accept his decision with respect and understanding," the group said via a statement posted at its website. "This is not an end, it is a new beginning. ... There are only positive feelings between us all and we will always remember the wonderful contributions he has made to this project."
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Country heavyweight Tim McGraw [ tickets ] will help launch "Let It Go," his first new studio album in nearly three years, with a March 14 appearance on ABC's "Good Morning America," during which he'll perform the new album's leadoff single, "Last Dollar."
McGraw recorded "Let It Go" in Nashville, and co-produced the set with Byron Gallimore and Darran Smith. Backing him in the studio was his touring band, The Dancehall Doctors.
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Maroon 5 [ tickets ] has nailed down a May 22 release for its sophomore full-length, "It Won't Soon Before Long." The set--which follows the band's 2002, multi-platinum, Grammy-winning debut, "Songs About Jane"--features the single "Makes me Wonder."
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Clothing company American Eagle has tapped Fergie [ tickets ], Ludacris [ tickets ], The Academy Is ... and Cute is What We Aim For to headline its spring-break celebration in Cancun, Mexico, this month. Details about the event, which runs through March 24, are posted at the company's website.