An envelope containing "white powder" was found in the package that contained what appeared to be a live explosive device at CNN's New York headquarters, New York Police Commissioner James O'Neill said Wednesday.

The offices, located in Manhattan, were evacuated in the morning and the package was removed to another location for potential detonation.

[READ: Pipe bombs scare: Here's what we know]

The package was reportedly addressed specifically to John Brennan, an MSNBC/NBC contributor and former CIA director. Brennan is a fierce critic of President Trump.

Similar packages were also delivered to the homes of Hillary Clinton and former president Barack Obama. And yet more suspicious packages were sent to former Attorney General Eric Holder and to a San Diego building that reportedly houses a field office for Sen. Kamala Harris, D-Calif.

It was not yet reported that any of those packages also contained any powdery substance.

The package sent to Holder, who worked under Obama, was improperly addressed, so did not make it to his home in Washington, D.C.