The FBI sent agents to assist in the investigation, but there was no immediate indication of terrorism or sabotage, said Judy Orihuela, spokeswoman for the FBI's Miami field office.

美国联邦调查局已经派遣特工协助调查，但目前尚无迹象表明这是一起恐怖袭击事件或者蓄意破坏事件。