Several people were carried out on stretchers and treated for heat-related health issues Sunday as they waited – and waited – on a sweltering Ohio afternoon for Hillary Clinton to show up at her Columbus campaign stop.

One report said up to 50 people were treated for heat-related illness as they awaited the Democratic presidential nominee, who ended up getting there 90 minutes behind schedule.

Columbus Division of Fire official Rebecca Diehm could not confirm that number, but told FoxNews.com that EMS resources were on-scene to treat dehydration -- and in some cases transport people via stretcher inside to cool their body temperatures.

The Clinton-Kaine rally, which was scheduled for 2:45 p.m. ET, did not start until almost 4:20 p.m. During that time, thousands of supporters endured temperatures in the high 80s while waiting outside the Fort Hayes Metropolitan Education Center in Columbus.

According to The Toledo Blade, after arriving late, Clinton delivered remarks lasting 21 minutes. Running mate Tim Kaine's speech was 15 minutes.

Earlier in the day, Clinton and Kaine were busy with other stops on their post-convention bus tour.

On Sunday morning, Clinton stopped in Cleveland Heights to surprise the congregation at the Imani Temple Ministry. Her entourage also stopped in Ashland for ice cream on the way to her afternoon rally, the Mansfield News Journal reported.

The Clinton campaign did not respond to a request for comment.

FoxNews.com's Liz Torrey contributed to this report.