Mexican authorities said that at least 14 people died in an armed attack at a prison in the northern border city Juarez and two more died during a later armed aggression elsewhere in the city.
The Chihuahua state prosecutor said in a statement that among those who died in the prison attack were ten security personnel and four inmates. At the same time, another 13 were hurt, and at least 24 escaped.
It was not immediately clear who carried out the attack.
The prosecutor said initial investigations found the attackers arrived at around 7am local time in armored vehicles and opened fire at the prison.
Minutes earlier, authorities had reported a nearby attack against municipal police. After a chase, four men were captured, and a truck was seized.
In a different part of the city, two more drivers died later in the day following what authorities called armed aggression.
The state prosecutor did not specify whether the three incidents were related.
In August, hundreds of Mexican soldiers were sent to Juarez after a prison face-off between members of two rival cartels caused a riot and shootouts that killed 11 civilians.