The Baltimore Ravens sent a letter this week to season-ticket holders, suite holders and sponsors about the number of no-shows at M&T Bank Stadium this season, citing a protest during the national anthem as one potential reason. The letter, which was signed by team president Dick Cass, mentions that there have been empty seats in the past when the Ravens have struggled on the field. But this year is different with Baltimore in the midst of a playoff race. "The numbers [of no-shows] are higher, and it is noticeable," Cass wrote in the 656-word letter. "There are a number of reasons for the no-shows, but surely the one-time protest in London has been a factor." The Ravens' first protest as a team occurred in London on Sept. 24, when more than a dozen players knelt during the national anthem before the first NFL game of the day. That began a daylong chain of protests in the wake of President Donald Trump's critical comments and tweets about protests during the anthem. The following week in Baltimore, the Ravens knelt in prayer before standing for the anthem. Fans at M&T Bank Stadium booed the players when they took a knee.