Marathon bombing suspects threw 'crude grenades' at officers By Mark Arsenault and Sean P. Murphy | GLOBE STAFF APRIL 21, 2013 ARTICLE COMMENTS ( 6 ) GETTY IMAGES A police officer ran with gun drawn while police searched for a bombing suspect early Friday morning in Watertown. PRINT REPRINTS E-MAIL Share via e-mail TO ADD A MESSAGE YOUR E-MAIL Cancel SHARE FACEBOOK GOOGLE+ LINKEDIN REDDIT TWITTER Marathon bombing suspect Tamerlan Tsarnaev was alive and struggling with Watertown police early Friday morning, when his younger brother and alleged coconspirator drove over him in a stolen SUV, dragging him on the pavement and apparently inflicting the fatal injuries that killed him, said Watertown Police Chief Ed Deveau in a Globe interview. Tsarnaev, 26, was pronounced dead early Friday morning at Beth Israel Deaconess Medical Center, after engaging police in ferocious firefight in Watertown. His brother, Dzhokar Tsarnaev, 19, is...