GLENDALE, Ariz. (AP) -- It wasn't just Justin Bieber's fans who had "Bieber Fever" as the teen idol kicked off his national tour in suburban Phoenix.
Video posted on KTVK-TV's website shows the pop music star vomiting twice on stage Saturday night during his sold-out concert at the Jobing.com Arena in Glendale. He left the stage after each episode but returned and even did an encore.
Find: Are Bieber and Selena Gomez secretly married?
KTVK reports Bieber's fans sang some of his songs while he was offstage and he later apologized for being sick.
Bieber later tweeted "Great show. Getting better for tomorrow's show !!!! Love u"
He later added: "And .... Milk was a bad choice!"
Bieber's 45-city "Believe" tour continues Sunday at the MGM Grand Garden Arena in Las Vegas.
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