Police dogs specially trained to detect explosives were spotted going for a walk with secret service agents near a hotel in Hanoi where a U.S. delegation is said to be staying for the upcoming summit between U.S. President Donald Trump and North Korean leader Kim Jong Un.

President Trump and Chairman Kim will meet in Hanoi on February 27-28, their second meeting in less than a year after a historic summit in Singapore on June 12, 2018.

Security is already tightened in the Vietnamese capital, especially near places said to house delegations of the U.S. and North Korea.

On Monday morning, U.S. secret service agents, dressed in civilian clothes, could be seen walking police dogs near the JW Marriott hotel in Nam Tu Liem District, Hanoi.

The specially trained dogs, popularly referred to as K-9 agents, sniffed their way through every corner of the luxury hotel, which housed former U.S. President Barack Obama during his official Vietnam visit in 2016.

A U.S. police dog sniffs a bush to detect explosives near the JW Marriott hotel in Hanoi, Vietnam on February 25, 2019. Photo: Danh Trong / Tuoi Tre

Dogs are often used in U.S. police forces to help detect drugs and explosives thanks to their sharp sense of smell.

U.S. and Vietnamese security guards are stationed inside and outside of the hotel compound, and the entrance to the hotel is strictly restricted.

Shops and businesses in the hotel’s vicinity were closed as of Monday as roads leading to the establishment had their sidewalks fenced off.

Vietnamese security agents could be seen inspecting tall buildings and elevated spots in the area close to the JW Marriott hotel on the same day.

North Korean leader Kim Jong Un arrived in Vietnam on Tuesday after traveling from Pyongyang by train, whereas President Trump is scheduled to arrive in the Vietnamese capital later the same day.

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