Several U.S. Capitol Police officers have been suspended and more than a dozen others are under investigation for suspected involvement with or inappropriate support for the demonstration last week that turned into a deadly riot at the Capitol, according to members of Congress, police officials and staff members briefed on the developments.

Eight separate investigations have been launched into the actions of Capitol officers, according to one congressional aide who spoke on the condition of anonymity to describe the status of the internal review.

In one of the cases, officers had posted what Capitol Police investigators found to be messages showing support for the rally on Wednesday that preceded the attack on the complex, including touting President Trump’s baseless contention that the election had been stolen through voter fraud, the aide said.

Investigators in another instance found that a Capitol officer had posted “inappropriate” images of President-elect Joe Biden on a social media account. The aide declined to describe the photographs.