TAMPA - UPDATE: Authorities said the package was only an unattended backpack, not dangerous
Authorities are investigating a suspicious backpack at the Republican National Convention's concert venue, Liberty Plaza.
The backpack was found on a stairway in the building.
A bomb squad is investigating the scene and officials are diverting people from the area.
The musical group Journey is scheduled to perform at the plaza Thursday night at 9:00 p.m.
Stay with ABC Action News for the latest on this developing story.