EL PASO, Texas -- Gunfire disrupts travel at a subway station in Mexico. Mexico City officials said a man opened fire at a subway station killing two people and wounding five others Friday.

Police are randomly checking people for guns at Mexico City's 175 subway stations. City officials said that more than 1,600 city police officers and 3,000 security officials have been assigned to patrol the stations starting Saturday.

Friday's shooting at the packed Balderas subway station shocked a city where holdups are common but random attacks on the public are rare.

The gunman was writing an anti-government statement on a wall when an officer confronted him. The man killed the officer and then continued firing as people got on and off a train. He also killed a construction worker who attempted to stop him. Police eventually captured him.