On April 22, 2013, the Middlesex County District Attorney's Office stated that it was actively investigating the possible connection of Boston Marathon bombings suspect Tamerlan Tsarnaev to the murders.
On 19 April 2013, the entire city of Boston was locked down and all public transportation stopped during the manhunt for Dzhokhar and Tamerlan Tsarnaev, the suspects of the 2013 Boston bombings, while the town of Watertown was under heavy-armed police and SWAT surveillance, as well as systematic house-to-house searches.