A man has been arrested after a woman was sexually attacked in Manchester city centre and for 'numerous' indecent exposures.Greater Manchester Police were called to Slate Wharf after a woman in her 20s was sexually assaulted.She said she was walking in the area at 8.50am on Wednesday, August 26 when she was approached by a man, who went onto attack her.A GMP spokesman said that there have been seven reports of a man indecently exposing himself in the Castlefield and St John's areas of the city