Four people were denied entry to Singapore under the city state’s bolstered safety measures for the summit between US President Donald Trump and North Korea’s Supreme Leader Kim Jong-un.

Those rejected entry included a man who had a mobile search record of suicide bombing, The Straits Times reported Sunday.

The man, unidentified other than his country of origin as one of the nations of the Association of Southeast Asian Nations, had looked up websites related to suicide bombs on his mobile phone and thus was not allowed to enter Singapore.

Kasiviswanathan Shanmugam, Singapore’s Minister for Law better known as K. Shanmugam, said in his meeting with reporters that the man could not provide coherent answers to questions from immigration officers. 

Before this man, a 34-year-old of Australian nationality was also denied entry due to past record of pseudo-terrorism activities.

No further details were given by the authorities regarding the other two rejections.

Minister K. Shanmugam said over 5,000 officers from the Singapore Police Force were deployed to guard the high-profile summit between Trump and Kim.

By Lim Jeong-yeo (kaylalim@heraldcorp.com)