European markets traded firmly in the red on Friday morning as concerns over the banking sector reached the region.The Pan-European Stoxx 600 was 1.5% lower at 8:26 a.m. in London (3:26 a.m. ET), with all major indexes and sectors in negative territory. The U.K.'s FTSE index was 1.5% lower, France's CAC 40 was down 0.7%, while Germany's DAX and Italy's FTSE MIB both fell over 2%.It comes as spillover from the U.S. banking sector hit European stocks on Friday, with the Stoxx Europe 600 Banks Index sliding ar ...