Authorities are on alert following a grenade attack near a popular park south of the border in Matamoros.
It all happened near the intersection of Calle Primera and Calle Alhelies just before 9 p.m. Saturday.
The intersection is located near Parque Olimpico, a popular park with a Christmas lights display.
Residents turned to the social media network Twitter to report the incident.
The American Consulate in Matamoros issued a warning via Twitter for area residents and visitors to avoid the area.
No injuries were immediately reported.
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