Security has been increased at Mexico City's airport so leftists challenging a tight presidential election cannot block flights as part of their crippling protests, the government said on Friday.
Extra safeguards have also been put in place at power plants, crude refineries and other installations of state-owned oil monopoly Pemex.
"Security has been stepped up," government spokesman Ruben Aguilar said. "Mexico City airport will always be in operation."
Claiming vote fraud, supporters of Andres Manuel Lopez Obrador have seized a long stretch of Mexico City's main Reforma boulevard and the huge Zocalo square to demand a recount of the July 2 election that the leftist narrowly lost.
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