Authorities are investigating a third suspicious package sent to U.S. Rep. Tom Feeney's offices.

The Florida congressman's Orlando office was evacuated Tuesday morning after a letter with a suspicious powder was found. On Monday afternoon, Feeney's Port Orange office at city hall was cleared out for the same reason.

Lab tests found the powder in both cases to be flour. Later Tuesday, postal officials said there was a suspicious package in Feeney's Titusville office. Authorities were still investigating what it contained.