Traffic is once again flowing through the Los Indios Interational Bridge.
Customs officers were diverted traffic on the north and southbound lanes early Wednesday afternoon.
U.S. Customs and Border Protection (CBP) Port Director Michael Freeman spokes to Action 4 News about the incident.
Freeman said the diversions were prompted by several reports of gun fire on the Mexican side of the bridge.
SWAT team members were brought in as a precaution.
"As the gunfire got closer to the Port of Entry, we had some reinforcements come in to assist just in case any of the bad guys wanted to come over," Freeman said.
Freeman said they did get word of bodies down on the Mexican side but cannot confirm any deaths or injuries.
Mexican Navy officials confirm that marines were involved in a shootout but said they were not ready to release details about the incident.