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Jim Harbaugh says threatening tweets a 'serious matter'

Detroit — Michigan coach Jim Harbaugh would not say whether he felt threatened by tweets directed at him this week by a former player, but he is confident the matter is being fully investigated.

For the last several days, a stream of menacing tweets have been posted to the Twitter account belonging to former Michigan linebacker Elysee Mbem-Bosse, who has not been on the team since last November. Some included mentions of guns and violent behavior and a potential threat against Harbaugh.

The University of Michigan Police Department opened an investigation into the tweets on Tuesday.