(Boston, MA)  --  Boylston Street is gradually reopening one week after the deadly Boston Marathon bombing.  City officials say business owners and residents are being allowed back in today to a six-block section that was at the center of the investigation.  They need to check in first at the Hynes Convention Center before being escorted to their sites.   Boylston Street remains closed to delivery trucks and other traffic for the time being.  The city has posted details for reopening the area on its website.