At least eight agencies are investigating a fire at a Bayer executive’s home as a possible arson, authorities said, as many companies increase security for executives following the killing of a United Healthcare CEO.

Authorities confirmed an arson investigation at the Madison, New Jersey, home of an executive of global pharma giant Bayer.

The FBI is investigating after a Bayer pharmaceutical executive’s New Jersey home caught fire earlier this month in a suspected arson attack. No one was injured in the March 4 incident, though the home was occupied at the time,