Mexican police use rubber bullets, free border rail crossing

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  • Masked men stand guard in front of a gas station in Veracruz, Mexico, Saturday, Jan. 7, 2017. As looting as largely subsided in Mexico, following a 20 percent hike in gasoline prices, neighborhoods in affected áreas have taken to guarding themselves from potential looters. (AP Photo/Felix Marquez)

    Masked men stand guard in front of a gas station in Veracruz, Mexico, Saturday, Jan. 7, 2017. As looting as largely subsided in Mexico, following a 20 percent hike in gasoline prices, neighborhoods in affected áreas have taken to guarding themselves ... from potential looters. (AP Photo/Felix Marquez) (The Associated Press)

  • Protesters hold candles by a sign that reads in Spanish "Enough already!" outside the headquarters of the government-run PEMEX oil company in Mexico City, Sunday, Jan. 8, 2017.  People are protesting a 20-percent gasoline price hike after the government stopped subsidizing and regulating prices for gasoline and diesel. (AP Photo/Marco Ugarte)

    Protesters hold candles by a sign that reads in Spanish "Enough already!" outside the headquarters of the government-run PEMEX oil company in Mexico City, Sunday, Jan. 8, 2017. People are protesting a 20-percent gasoline price hike after the ... government stopped subsidizing and regulating prices for gasoline and diesel. (AP Photo/Marco Ugarte) (The Associated Press)

  • Supermarket displays stand empty and looted following protests caused by a 20 percent hike in gasoline prices, in Veracruz, Mexico, Saturday, Jan. 7, 2017. The Interior Department reported that more than 1,500 people have been detained for looting or disturbances nationwide since protests began early in the week. (AP Photo/Felix Marquez)

    Supermarket displays stand empty and looted following protests caused by a 20 percent hike in gasoline prices, in Veracruz, Mexico, Saturday, Jan. 7, 2017. The Interior Department reported that more than 1,500 people have been detained for looting or ... disturbances nationwide since protests began early in the week. (AP Photo/Felix Marquez) (The Associated Press)

Police in the Mexican state of Sonora say they fought a pitched three-hour battle to free a border rail crossing at Nogales that had been blocked by people protesting a gasoline price increase.

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The Sonora state government says two police officers were injured and two protesters were arrested Sunday.

The demonstrators were protesting a recent 20-percent hike in gasoline prices.

The state government said officers who tried break up the blockade were attacked with rocks for about three hours and responded by "firing rubber bullets into the air."

The government said 11 trainloads with about 1,000 cars of merchandise headed for the United States had been backed up by the protest.

It said the blockade had threatened to temporarily shut down Ford Motor Co.'s stamping and assembly plant in Hermosillo.