Another attempt by the US president to cosy up to the North Korean leader.
Police say the suspects defaced the walls with Korean scripts which meant 'Free Korea'.
Analysts believe the rogue nation has 20 to 60 nuclear warheads which could threaten the US.
This is according to a senior US State Department official.
Kim and Trump failed to agree on the key issue of the denuclearization of the Korean peninsula.
He states this ahead of the second US-N Korea summit in Hanoi scheduled for Feb 27 and 28.
It was reported that Jo Song Gil is seeking asylum in the West.
This includes the names, birth dates, and addresses of the defectors.
Otto Warmbier's parents had sued Pyongyang in April over the torture and death of their son.
Diplomats say only eight of the 15 members of the UN Security Council are backing the bid.
The two moves send conflicting signals at a time of sensitive negotiations.
The show of force takes place in waters south of China and within striking distance of North Korea.
Lee Hae-chan, the head of the Democratic Party, says that the visit may happen next spring.
However the S Korean president did not elaborate further.
FEATURE | Summit agreements are positive first steps, but don't impact N Korea's existing nuclear capabilities.
South Korean President Moon Jae-in in Pyongyang to discuss denuclearisation, end of war.
White House looking at scheduling a meet between the two leaders.