Police in Mexico's capital said they had arrested 76 people for looting about 29 stores.
Veracruz Gov. Miguel Angel Yunes Linares ventured out Thursday and tried to persuade a crowd not to attack a grocery store that had already been looted a day earlier. He offered the crowd coupons for 500 pesos ($23.25). Yunes later said that wasn't an incentive to stop looting, but rather offered as assistance to help single mothers buy holiday gifts.
In Mexico State, which borders Mexico City, 529 people had been detained as suspected looters. Four state police officers were fired and detained after they were caught on video taking some looted items and putting them in their patrol vehicles. The state government said the looting had quieted down Thursday. But video of the Wednesday disturbances showed riot-like scenes of people streaming out of stores carrying flat-screen TVs and other items.
Officials claimed many of the lootings incidents were promoted through social media.
With blockades affecting everything from gas distribution terminals, seaports and highways to shopping centers and gas stations, the Communications and Transport Department announced it would cancel permits for any truckers who block roads.
Truck and taxi drivers have been among the most affected by the fuel price increases, which took effect as the government ends regulated prices for gasoline and diesel, which it says represented subsidies that unduly benefited wealthier Mexicans.
The change boosted the average price for a liter of premium gasoline to 17.79 pesos (about 90 cents). That makes 4 liters, or about a gallon, equal to nearly as much as Mexico's just raised minimum wage for a day's work - 80 pesos (about $4).
The National Association of Self-Service and Department Stores of Mexico has said in a statement that more than 79 stores had been looted and 170 were closed or blockaded in central Mexico, including the capital.
In the city of Veracruz, 50 establishments including convenience stores, supermarkets and big-box outlets suffered looting, according to a preliminary count by the local chamber of commerce.