KEY TAKEAWAYS:

Three Rhesus monkeys remain missing after a truck overturned in Mississippi .

Tulane University confirmed the monkeys were pathogen-free and sent experts to help.

Authorities warn the monkeys are aggressive and should not be approached.

Highway Patrol investigates the crash about 100 miles north of Jackson.

Three monkeys were still on the loose Wednesday in Mississippi after a truck carrying the research animals overturned, but it remained unclear who owns the monkeys, who was transporting them and where they were being taken.

The monkey mystery left a host of unanswered questions for authorities.

Officials said at midday Tuesday that all but one of the escaped Rhesus monkeys had been killed. But the Jasper County Sheriff ‘s Department later said officials fr

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