Gunmen killed 25 people in a series of drug-gang attacks in Ciudad Juarez, marking the deadliest day in more than two years for the Mexican border city.
Farther east on the border, 85 inmates scaled the walls of a prison and escaped on Friday in Mexico's biggest jail break in recent memory.
Despite the violence, President Felipe Calderon hotly disputed a statement this week by US Secretary of State, Ms Hillary Clinton, saying Mexico resembled Colombia two decades ago.
"These kind of comments like the ones made by Secretary of State Clinton ... so careless, so lacking in seriousness, are very painful for Mexico, because they damage Mexico's image terribly," Calderon told the Spanish-language network Univision.
"I think the main thing we have in common with Colombia is that both of our countries suffer from US drug consumption," Calderon said. "We are both victims of the enormous American consumption of drugs, and now the sales of weapons."
The toll in Thursday's attacks in Ciudad Juarez included 15 people killed when attackers stormed four homes in three hours, said Arturo Sandoval, a spokesman for the Attorney General's Office of Chihuahua state, where Ciudad Juarez is located.
In the worst of those attacks, gunmen burst into a house and killed two young men then killed four others for being witnesses.