Chilly overnight temperatures did not slow down gunmen south of the border in Reynosa.
Residents on the city's southside woke up to the sound of gunfire early Tuesday morning.
Authorities have not released official information but many residents turned to the #reynosafollow hashtag on Twitter to report the gun battle.
Residents reported gunfire along the Reynosa-Matamoros Highway near the populous Puerta del Sol and Cumbres neighborhoods just after 5 a.m. Tuesday.
Photos of Mexican soldiers quickly circulated on Twitter and other social media networks.
Residents also reported that gunmen used tire spikes against authorities delaying the Tuesday morning rush hour commute.
Action 4 News will provide more information as it becomes available.