Police were still searching Thursday for a gunman who shot a pregnant bank teller during a robbery, but they arrested four men in connection with the crime.

The four face preliminary charges of conspiracy to commit robbery after police questioned as many as eight people described as "persons of interest." Authorities said none of the four were believed to be the gunman.

At least three of the four people were taken into custody after a SWAT raid at a duplex on the city's east side Wednesday.

Tuesday morning, a masked gunman entered a Huntington Bank branch, jumped over the counter, shot teller Katherin Shuffield and grabbed cash from her drawer, police said.

The 30-year-old Shuffield is five months pregnant with twins. The bullet entered her abdomen but missed both fetuses. Her husband, Jason Shuffield, said Wednesday she remained in critical but stable condition at Methodist Hospital.

"She is resting and recovering slowly," he said in a statement. "She is still carrying our twin babies and the staff at Methodist Hospital is monitoring the situation closely as this remains a high-risk pregnancy."

Police identified those arrested as Shead James, 25; Joseph Wilburn, 22; Stevan Peterson, 21; and Tyrone Daniels, 33. James was being held in Marion County Jail, while the whereabouts of the others were unclear.

A fifth man, Eric Sims, whose house was searched by police, was arrested on a charge of child neglect. Sgt. Paul Thompson said police were unsure of his involvement. He was not at the jail late Wednesday night.

Katherin Shuffield has relatives in Peru, and the family is working with the U.S. Embassy there to arrange for her mother and siblings to obtain visas to come and visit, the family said.