"US government personnel are subject to restrictions on their movements and an evening curfew until further notice", the consulate wrote on Twitter.
The consulate staff was advised to stay away from public places, and monitor local media for new information.
On Friday, according to media, there were six shootings, including an attack on a police convoy, in which an armed criminal was killed.
On Thursday, seven people died in three firefights, including one soldier.
Previously, three American Mormon families sustained a savage attack in northern Mexico, where nine people lost their lives, the Mexican security minister said.