Police in Arizona report having two people in custody for the string of shootings that have left both civilians and authorities in Phoenix on edge for the past two weeks.

Arizona Department of Public Safety Bart Graves confirmed the report, saying people are being questioned, but he doesn't have additional details, according to the Associated Press.

Police found the suspects, one man and one woman, as authorities were focusing on a white SUV at a convenience store near I-10. Graves notes that only the man is of interest to investigators, and are now finished with the woman. Her status is unknown.

Graves also revealed that the man hasn't been arrested and that questioning could continue for hours.

This development comes just a day after the 11th shooting in the area was confirmed when a bullet pierced the side of a tractor-trailer Thursday morning, according to NBC News.

Mark Spicer, who served as a sniper in the British Army for 25 years, chimed in on Arizona's situation, and believes there are two shooters and at least one copycat.

Spicer, who was also a key witness in the prosecution of the suspects who were responsible for the 2002 sniping incident in Washington D.C., doesn't believe the person is a professional, but notes there is a possibility that the suspect is intentionally missing, according to Fox 10 Phoenix. 

"It can be a multitude of reasons, one of which the person wants to be famous, but doesn't want to kill people, so he could be missing on purpose just to scare people. It may be that the person is an amateur, and they don't understand the correlation between the moving bullet and the ballistics and the moving vehicle. Or it could possibly be your worst case scenario, somebody who is making the police look stupid and is going to step his game up later," he stated.

"What a sniper can do is get inside somebody's head and terrorize an entire community, even a city as big as Phoenix and disrupt almost the entire economics of the city by just making people late for work, making people not go to work, parents keeping their kids from school because they don't want to take them through that risk. It's a very easy weapon to use and a very difficult weapon to stop," he concluded.

Spicer says the key to stopping the sniper will be to get inside that sniper's head.