Luis Bianchi, 25, is being held on $5000 bond on child neglect charges, according to Miami Police.
Officials began looking for the man Wednesday night when they were alerted that a three-year-old was roaming the halls of her father's apartment at 922 SW 3rd Street.
When police arrived, they entered the apartment that the girl and neighbors said she lived in to try to find her parents. When they checked the bedroom, officers noticed several high-powered weapons, specifically AR-15s, and a grenade sitting on a table in plain view, according to an arrest affidavit.
Officials said the weapons were unsecured and in arms-reach of the child.
Police say Bianchi turned himself in after seeing the report on the evening news. He told officials he left his daughter at the apartment at about 6 p.m. after speaking to her mother, who said she was on her way, the affidavit said.
Since he was running late to work, he said he sat his daughter down in front of the television, put a couch against the door to his room where the weapons were and left, according to the affidavit.
He told police that he left the door to the apartment locked before leaving, officials said. When police asked him about the weapons, he said he leaves them on a table, but blocks the door to his room with the couch, the affidavit said.
However, officials said the couch was not completely blocking the door.
A man who said he is the girl's grandfather said Wednesday that his son had a permit to carry guns, but perhaps not a grenade.