(CNN) A good Samaritan decided to use the $900 he'd been saving to do something nice for Detroit nurses on the front lines of the fight against the coronavirus pandemic.

Allen Marshall spent Wednesday and Thursday at an Exxon station near the Detroit Medical Center with a sign that said "FREE GAS FOR NURSES."

"I just love them and I want them to know that," he told CNN affiliate WDIV

Michigan is one of the hardest-hit states in the coronavirus pandemic, according to Johns Hopkins University, with 10,791 cases and 417 deaths

Imran Al Samet works at the station and told CNN that Marshall had bought gas for between 50 and 80 people on Wednesday and Thursday morning.

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