The district attorney prosecuting a man accused of setting fire to Pennsylvania Gov. Josh Shapiro’s official residence says investigators are still assessing whether religious or political bias figure into the potential motive.

The arson attack lasted for several minutes. Shapiro and first lady Lori Shapiro, as well as other guests and staff members, were inside the residence when the fire erupted around 2 a.m. No one was injured, and Shapiro's family was safely evacuated. However, prosecutors said the residence sustained "substantial damage."