French police have arrested a 24-year-old Algerian computer student suspected of planting a bomb in Lyon last week.<br />Authorities said Monday the blast wounded 13 people, in what is being treated as a terrorism investigation.<br />Three other people were also arrested in connection with the case.<br />A man was spotted by security cameras leaving the explosive device in front of a bakery's doorway.<br />It was loaded with screws and metal balls packed into a paper bag. <br />
