Two more Chinese nationals have been arrested for illegally taking photographs at a Florida Navy base, court records show.

Yuhao Wang and Jielun Zhang, both 24, were arrested on Saturday, bringing to four the number of Chinese people charged recently with snapping pictures at the Naval Air Station in Key West, Florida.

An FBI affidavit says Wang and Zhang, both University of Michigan students, drove up to the Sigsbee Annex entrance and were told by a security officer they could not enter the property without military identification.

The FBI says the pair drove onto the base anyway and were apprehended by authorities about 30 minutes later after taking photos of structures on the base.

When U.S. Navy Security Forces located the students in their blue Hyundai car, they were carrying cellphones and a Nikon camera.

They admitted the guard told them to leave the area and agreed to show the agents their photos.

Two more Chinese nationals were arrested for taking pictures of South Florida military installations

Yuhao Wang and Jielun Zhang, 24, were taken into custody Saturday as they approached the guard station at Sigsbee Annex in the Naval Air Station in Key West

Since the fall of 2018, there have been four arrests, drawing the interest of U.S. counterintelligence investigators concerned over potential Beijing-led spying activities.

During their first appearances in Key West federal court Monday, the two asked to have lawyers appointed to represent them. Magistrate Lurana Snow agreed to give Wang a public defender, but declined to do the same for Zhang. They are required to each contribute $7,500 to the cost of their defense.

The arrests follow two similar cases involving Chinese nationals taking photos at the Key West base.

Since the fall of 2018, four people have been arrested, drawing the interest of U.S. counterintelligence investigators concerned over potential Beijing-led spying activities.

On December 26, Chinese student Lyuyou Liao was charged with entering the Truman Annex at the Naval Air Station in order to take photos. Several witnesses said they saw Liao trespass, warning him against it.

Liao, 27, is being held without bail. His lawyer argued at a recent hearing that Liao was on vacation taking pictures and that evidence of any crime is thin.

His Daniel Rashbaum told the judge: 'It sounds like a tourist taking some pictures.'

However, while some photos depicted typical tourist scenes, after a search warrant was obtained, investigators found a number of pictures of the military facility on his cellphone.

Back in September 2018, Chinese national Zhao Qianli was arrested at the Naval Air Station in Key West. Investigators found photos and videos on Qianli’s cellphone and digital camera of government buildings and a Defense Department antenna field on the military base.

The 20-year-old pleaded guilty last February and was sentenced to one year in prison by U.S. District Judge K. Michael Moore.

Zhao Qianli was sentenced to a year in prison for taking pictures of the Naval Air Station in Key West

President Trump's Mar-a-Lago resort in Palm Beach has also been targeted as well.

In March 2019, a Chinese woman was arrested after she gained entrance to the complex claiming she was attending a 'United Nations friendship event,' which she reportedly knew was cancelled before leaving China.

U.S. District Judge Roy Altman sentenced Yujing Zhang, 33, to eight months in prison or time served in custody since her arrest.

As recently as December Lu Jing, 56, was taken into custody for trespassing and taking pictures at Mar-a-Lago.