Boston and Miami will be added to the list of 11 airports that are being used to divert passengers traveling to the US from European regions that are part of a travel ban, a senior official with US Customs and Border Protection said.

The new airports — Miami International Airport and Logan International Airport — go into effect at 11:59 p.m. Friday, the senior official said on a press call, adding that "anyone already en route is not impacted by this,"

Some background: President Trump announced the ban during an address on Wednesday. The ban would affect most foreign nationals who were in Europe's Schengen Area — 26 countries stretching from Iceland to Greece — in the past 14 days. American citizens, green card holders, some family members and a few other groups are exempt from the travel ban but will face additional health screening and restrictions when they arrive.

On Thursday, Vice President Mike Pence told CNN that Americans coming home will be funneled through 13 different airports.

“They'll be screened and then we're going to ask every American and legal resident returning to the united states to self-quarantine for 14 days," Pence said.

These are the other airports: