A U.S. citizen and a Pakistani national were arrested in an alleged plot to bomb a subway station in midtown Manhattan and possibly other locations around the city, police said. Police Commissioner Ray Kelly said Saturday the men were not thought to be connected to al-Qaida or any other international terrorist organization, although he said they expressed hatred for America. The arrests came two days before the start of the Republican National Convention, which is drawing tens of thousands of visitors to the city. Though there was no clear tie to the convention, authorities moved to arrest the two men before it began. The men had been under police surveillance and had discussed placing explosives at the Herald Square subway station and stations at 42nd and 59th streets, Kelly said. The men never obtained explosives, he said.