(VOVworld) - Two FBI agents were shot and wounded at a house in north St. Louis County in Missouri early Wednesday. The incident does not appear to be directly related to the racially charged unrest in and around nearby Ferguson.

Protesters face off against a line of police during a demonstration outside LAPD headquarters, following the Monday grand jury decision in the shooting of Michael Brown in Ferguson, Missouri, in Los Angeles, California November 25, 2014 (Photo: Lucy Nicholson/Reuters)

FBI spokeswoman Rebecca Wu said the incident took place while the agents were assisting local police in executing an arrest warrant. Their injuries were not life-threatening.

Meanwhile the situation in Ferguson continues to be unstable. Some 2,000 National Guard troops helped ward off a second night of rampant arson and looting in suburban St. Louis after a grand jury declined to indict a white policeman in the fatal shooting of an unarmed black teenager, and sympathy protests spread to several US cities.