At least three federal cabinet ministers have been sent envelopes containing white powder, CTV News has confirmed.

The envelopes were sent to the Quebec offices of Denis Lebel, Christian Paradis and Maxime Bernier.

Police are investigating the possibility that a fourth package was delivered to the Quebec office of Public Safety Minister Steven Blaney, CTV Ottawa Bureau Chief Robert Fife has learned.

One Paradis staffer was taken to hospital.

It is not known at this time why the staffer was hospitalized or what the white powder is.

Lebel acknowledged that his office received a "suspicious package" Thursday morning.

"These actions are taken very seriously," Lebel said in a statement. "The safety of Canadians is a priority for our government. There can be no doubt that we will not be intimidated."

Lebel is Canada’s minister of Infrastructure, Communities and Intergovernmental Affairs. He is also minister of the Economic Development Agency of Canada for the Regions of Quebec.

Paradis is minister of Economic Development and Minister for La Francophonie.

Bernier is the minister of State for Agriculture and Small Business and Tourism.