UPDATE (4:39 p.m.):
ADOT has confirmed that both northbound and southbound I-19 are open.

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Interstate 19 southbound is shut down due to a two-car fatal crash at kilometer post 83, according to the Arizona Department of Public Safety. Two persons are deceased. I-19 southbound is closed at San Xavier Rd. Traffic is being routed to exit at San Xavier Rd.
Northbound I-19 is still open but is subject to close, the post said.
HERE IS A VIEW AT I-19 AND SAN XAVIER ROAD FROM ADOT (3:00 p.m.):
Drivers should find an alternate route.
HERE IS A VIEW AT I-19 AND VALENCIA ROAD FROM ADOT(3:00 p.m.):

Santa Rita Fire Department said crews are also at another crash on northbound Interstate 19, at kilometer post 84.
Northbound traffic is heavy, the post said.