Singer was reportedly watching a basketball match prior to the concert
Singer is the victim of latest celebrity "swatting" prank
World tour continues to be dogged by problems on the road
'Diamonds' singer smiled for photographs and signed autographs for 16 minutes
US network Fox will air behind the scenes look this May
Singer pulls out of Baltimore show as she continues to recover
Singer forced to pull the second date on her 'Diamonds' tour on advice from doctors
Reports say singer will take a year off from her career
The singer tops the Spotify poll of the last six months