WASHINGTON, March 6 (Reuters) - President Donald Trump's

suspension of 25% tariffs on most goods from Canada and Mexico

announced on Thursday is not retroactive, a White House official

confirmed.

Some automaker officials told Reuters tariffs paid on any

vehicles or parts shipped from Tuesday through Thursday from

Mexico or Canada into the United States will not be refunded.

Trump's order suspending the duties takes effect at 12:01

a.m. Eastern time on Friday.