People queue for security check outside the Cathedral of the Holy Cross where U.S. President Barack Obama is scheduled to attend an interfaith service for the victims of the Boston Marathon bombings in Boston, Massachusetts April 18, 2013. Obama was due to visit Boston on Thursday to attend a memorial service for victims of the Boston Marathon bombing amid a manhunt for a suspect seen on video taken before two blasts struck near the finish line on Monday.  REUTERS/Jessica Rinaldi Photo: Reuters / X01704