Whaley said she received several calls from across the country.

\"I'm heartbroken,\" Whaley tweeted Sunday morning. \"Thank you to our first responders for all that you've done. We will share updates as we have more information.\"

In addition to local police, the FBI is on scene assisting with the investigation.

We are actively investigating an active shooter incident in the #OregonDistrict. Please avoid the area. More information to come.

— Dayton Police Dept. (@DaytonPolice) August 4, 2019

\"This is a large scene and investigation. Thank you for your patience,\" Dayton police added in a subsequent tweet.

\"PHOTO:
John Minchillo/AP
PHOTO: Authorities work the scene of a mass shooting, Sunday, Aug. 4, 2019, in Dayton, Ohio.
>

Two bars in the Oregon District — Hole in the Wall and Ned Peppers — wrote on Instagram that their staff was safe.

#BREAKING: Even more police presence down by Dublin Pub. Waiting to hear where office scene is. pic.twitter.com/OWpYox1OTQ

— Molly Reed (@MollyR247Now) August 4, 2019

The shooting comes just 14 hours after a gunman killed 20 people and injured over two dozen more at a Walmart 1,600 miles away in El Paso, Texas.

The shooting in El Paso was the eighth-deadliest in modern U.S. history. Five of the top 10 deadliest shootings in U.S. history have occurred since 2016.

President Donald Trump tweeted Sunday morning that the \"FBI, local and state law enforcement are working together in El Paso and in Dayton, Ohio,\" adding that \"updates will be given\" as more information is gathered in both shootings.

He added in a subsequent tweet, \"God bless the people of El Paso Texas. God bless the people of Dayton, Ohio.\"

God bless the people of El Paso Texas. God bless the people of Dayton, Ohio.

— Donald J. Trump (@realDonaldTrump) August 4, 2019

During his Sunday mass, the pope referenced the three shootings in Gilroy, El Paso and Dayton, asking worshipers \"to join my prayer for the people who lost their lives, the injured and their family members.\"

\"I am spiritually close to the victims of the episodes of violence that have bloodied Texas, California, and Ohio in the United States, striking defenseless people,\" Pope Francis said.

ABC News' Josh Margolin and Aaron Katersky contributed to this report.

This is a developing story. Please check back for updates.

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