NEW YORK - The New York City Police Department says it's monitoring an explosive device on a London subway train that British authorities on Friday labeled a "terrorist incident".

Police Commissioner James O'Neill tweeted photos showing the device which was stored inside a plastic bucket inside a supermarket freezer bag.

#NYPD closely monitoring incident on London subway moments ago. No direct threats to #NYC, but always remain vigilant/aware of surroundings. pic.twitter.com/xH72sHvgo9

It happened during the morning rush at the Parsons Green station in Southwest London.

Passengers were evacuated, and authorities say more than a dozen people were injured.

None of the injuries are considered serious or life threatening.

Britain's terror alert level has not been raised.

London Mayor Sadiq Khan says the incident will not change his city.

"These terrorists, these evil and cowardly individuals who want to divide us and disrupt our way of life. As the mayor of London I can say this and I can speak for Londoners - we are not going to allow them to do so," Khan said.

President Donald Trump tweeted a response Friday morning, condemning those behind the attack as "loser terrorists".

Another attack in London by a loser terrorist.These are sick and demented people who were in the sights of Scotland Yard. Must be proactive!

Loser terrorists must be dealt with in a much tougher manner.The internet is their main recruitment tool which we must cut off & use better!

The NYPD says there are no direct threats against the five boroughs.

A department official says New Yorkers may see additional counterterrorism resources deployed around mass transit hubs.