Jennifer Lopez, who is in Argentina as part of her "Dance Again" tour was robbed, just hours after leaving a clinic due to a stabbing pain in her lower back.Local entertainment website Primicias reports that the thief took personal items from Lopez's dressing room, while she performed at the GEBA stadium in Buenos Aires on Thursday.The stolen goods, according to the publication, include a computer, a camera and a bag with personal documents such as IDs and passports.Complicating matters, Primicias says Lopez's manager Benny Medina, who was also robbed, has not been able to leave the country since he lost all forms of identification.Details have also surfaced of Lopez's scary rush to the hospital moments before the robbery.It appears that the "On the Floor" singer experienced extreme back pain. According to Spanish network Univision, Lopez interrupted her sound stage and was taken to a clinic.The singer took to Twitter to talk about the incident, revealing that her children had something to do with the hospital scare."Got an xray this morning...all good...pulled back muscle," she tweeted Thursday. "Coconuts getting to big to carry both at once. Awww... #timeflies :( "Despite the accident, Lopez did not cancel her elaborate, two-hour concert, in which she performed old tunes such as "Get Right," "Let's Get Loud," "Waiting for Tonight" and her popular song "Jenny From the Block."