Mexico City's government ordered traffic restrictions on Tuesday and recommended people stay indoors due to serious air pollution, issuing its second-highest alert warning for ozone levels for the first time in 13 years. 

 Authorities searched a mass grave near Mexico City as anxious relatives braced to learn whether the remains were those of 12 young people kidnapped in May.

 An explosion in the headquarters of Petroleos Mexicanos (Pemex) in Mexico City on Thursday left 14 people dead and 80 others injured, the Mexican oil giant said on its Twitter account.