In the United States, the city of Mc Allen on the border with Mexico in Texas was fired. Two policemen were killed in it.
This was reported by the Associated Press.
Law enforcement officers arrived at the call in connection with emergency circumstances.
The Texas Department of Homeland Security spokesman, Lieutenant Christopher Olivare, said police officers were fired in the south of the city.
The attacker was also shot, but nothing is known about his condition.
The reasons for the shootout are being clarified.