Four US citizens kidnapped in Mexico border city, FBI says

Gunmen opened fire on vehicle in northern city of Matamoros, and FBI is offering $50,000 reward for return of victims

Four US citizens have been kidnapped after gunmen opened fire on their vehicle in the northern Mexico border city of Matamoros, according to the FBI.

The four had entered Matamoros, across from Brownsville, Texas, on Friday and were travelling in a white minivan with North Carolina license plates.