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 in Beth Israel Deaconess Medical Center