Exactly 30 days after the Lyon Building bombing was the infamous Los Angeles Times bombing of October 1, 1910, which killed 20 non-union newspaper employees and raised questions among local law enforcement of whether the two bombings were related and whether the suspects hadn't fled the city immediately. By the time the McNamara Brothers were arrested for the LA bombings in April 1911, the Lyon case was still unsolved with a reward now reaching $5,000 but revelations in the ensuing inquisition would soon prove them correct. California authorities revealed through questioning that James B. McNamara had confessed to being in Seattle on the night of the explosion where he checked into a cottage in the rear of 1020 6th Ave on the 19th under the alias of J.B. Bryce but referring to himself as "Petervitch". He would spend the next week buying supplies and building a bomb that could be detonated by electric spark and while posing as a miner, attended explosive classes and even took pieces of his device to an electric shop directly across the street from the Lyon Building for repairs. McNamara also confessed to having acted alone in the bombing, despite evidence that he was being shadowed by an accomplice and had support from local iron workers union leadership; the motive being retaliation against Stone &amp; Webster's non-union labor policies.