Wheeles said the crash happened at about 5 a.m.
One of the semis was hauling hazardous material, which led to the chemical fire. Police say cleanup crews are dealing with an explosion risk.
Indiana State Police said the power lines came down on I-80/94 at Chase Street.
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The cause of the crash is still under investigation.
All lanes northbound and southbound of I-65 at mile marker 43 (near the crossing of State Road 250) are now closed. Seek an alternate route and leave yourself extra time if traveling in the area today. Houses within a half-mile have been evacuated, according to his Twitter feed.
This story will be updated.
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According to the Indiana State Police, just after 4:30 troopers responded to a personal injury crash on southbound I-65, south of Seymour.
Authorities say the collision caused one of the trailers to leak a hazardous chemical, and eventually at least one of the rigs caught fire, sending black smoke billowing into the air. Much of the pavement along the right lane, shoulder and part of the left lane were heavily damaged.
The Indiana Department of Environmental Management is cleaning up the chemicals, WLFI-TV reported. Work is expected to last through the late afternoon hours.
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The investigation is ongoing.