Who is Sayfullo Saipov, New York City terror attack suspect?

Investigators have identified the man they believe drove a rented pickup truck onto a Manhattan bicycle path Tuesday, killing eight people and injuring 12 others in New York City's deadliest terror attack since Sept. 11, 2001.

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Here's what we know about the suspect, 29-year-old Sayfullo Habibullaevic Saipov: