We’re very worried this person may harm himself or others if he continues to experiment with thermite,” said W. Mike Harrington, the FBI special agent in charge in the Seattle office.

The FBI said Thursday the suspect in the Oregon and Washington ballot box fires in October used a welding material that can burn at 4,000 degrees.

Federal authorities announced Tuesday that they have erased Chinese malware from thousands of computers across the United States.

The FBI and international partners sent a self-destruct command to PlugX malware French cybersecurity firms and law enforcement agents, together with partners from the United States, have successfully removed Chinese-built malware from thousands of infected PCs.

The FBI recently achieved a significant victory by removing malicious software called PlugX from over 4,000 computers and networks across the United States. This malware, created by a hacker group known as Mustang Panda,