Authorities are still investigating the cause of a fire that destroyed a Bob Evans restaurant on East Dublin-Granville Road last week.

Two Columbus firefighters were treated at hospitals for injuries suffered while battling the May 10 fire. The blaze was reported at 2:46 a.m. while the restaurant, 960 East Dublin-Granville (Route 161) was closed, and firefighters had it under control around 4 a.m. However, the building reignited, sending firefighters back to the scene at 9:46 a.m.

One firefighter suffered a shoulder injury during the first response and was taken to Mount Carmel St. Ann's hospital for treatment and later released, Fire Battalion Chief Steve Martin said.

Another firefighter was taken to OhioHealth Riverside Methodist Hospital for heat exhaustion after crews returned to the restaurant, Fire Division spokeswoman Rebecca Diehm said. That firefighter also was treated and released. No other injuries were reported.

The building was a total loss, Martin said.

The one-story, 6,578-square-foot restaurant was built in 1995 and is owned by Cole BE Portfolio, a limited liability corporation based in Phoenix. The restaurant and property, which consists of two parcels, were transferred to Cole in June 2017 for more than $2.1 million, according to Franklin County auditor's office records. The building and property had an assessed value of $1,029,790; tax bills were still being handled through Bob Evans corporate headquarters in New Albany, records show.

"We are thankful that nobody was in the Bob Evans restaurant on Dublin-Granville Road when the fire started," Bob Evans CEO Saed Mohseni said in an emailed statement. "It is too soon for us to understand the full implications of the fire. What we can say is that we have been able to relocate all of the affected employees to nearby restaurants, so they will continue to be employed."