Stock futures are pointing to a lower open after Japan upgraded its nuclear crisis to the highest level and Alcoa Inc.'s first-quarter revenue growth disappointed.
Japan raised the severity of its crippled nuclear plant, which was damaged following a March 11 tsunami, to level 7 from 5. That's the same level as the 1986 Chernobyl disaster.
Alcoa started earnings season late Monday by saying it returned to a first-quarter profit. But it also reported $5.96 billion in revenue, short of the $6.16 billion that analysts expected.
Ahead of the opening bell, Dow Jones industrial average futures are down 57, or 0.5 percent, to 12,264. S&P 500 futures are down 7, or 0.5 percent, to 1,312.60. Nasdaq 100 futures are down 10.50, or 0.5 percent, to 2,297.50.