INDIANAPOLIS -- Four men were arrested Wednesday in connection with a robbery in which a pregnant bank teller was shot this week, but investigators still are looking for the shooter, authorities said.

The four were being held on preliminary charges of conspiracy to commit robbery relating to Tuesday morning's heist and shooting at the Huntington National Bank, 2030 N. Post Road.

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Slideshow: Police Seek Shooter

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Police did not immediately say what roles investigators believe the four played in the robbery, during which a masked man shot teller Katherin Shuffield, who is five months pregnant with twins and still was hospitalized in critical condition Wednesday.

Arrested Wednesday were: Shead James, 25; Joseph Wilburn, 22; Stevan Peterson, 21; and Tyrone Daniels, 33, all of Indianapolis.

The arrests were announced after investigators served search warrants at two locations, including a duplex (pictured) in the 600 block of North Keystone Avenue. During the 6:30 p.m. Wednesday raid on the duplex, investigators found what they believed was evidence relating to the robbery, Indianapolis Deputy Police Chief William Benjamin said.

Shortly before the four arrests were announced, police said they were questioning up to eight people, including three who were found at the duplex. Benjamin said police raided the duplex after receiving information from a confidential informant, 6News' Renee Jameson reported.

One of the men found at the duplex was arrested on a child neglect charge not related to the robbery, police said.

Police said a man robbed the bank at about 9:30 a.m. Tuesday and shot Shuffield, 30, of Franklin, in the lower abdomen. Shuffield still is carrying the unborn children, her husband said in a statement released by hospital staff.

Officials said Tuesday that the twins were not struck by the bullet and were not believed to be in immediate danger.

Ministers To Shooter: Surrender To Us

At a news conference late Wednesday afternoon, some local ministers called on the shooter to surrender to one of them.

One of the ministers said the shooter and anyone who helped him should take the offer, arguing that they'll be caught one way or another, and that the ministers would help make a surrender to police smooth.

"We will bring you in and work with the police if you are afraid to turn yourself in to the law enforcement community," said the Rev. Charles Harrison, of the Barnes United Methodist Church. "But you must turn yourself in because you will be apprehended, because this is unacceptable in our community."

The ministers said the shooter or his accomplices could call them at the following numbers: 317-281-3035, 317-752-0602 or 317-281-1151.

Indianapolis Police Chief Michael Spears endorsed the ministers' offer.

"Speaking to those involved ... just turn yourself in," Spears said. "We will work with the churches and the pastors to make certain this goes as smooth as possible, but a lot of that is in your hands."

Police said anyone with information about the shooting should call Crime Stoppers of Central Indiana at 317-262-8477.

Search For Gunman, Accomplices Intense

The police search for the shooter and accomplices was intense Wednesday morning, with dispatchers broadcasting a description of the shooter to officers citywide every 30 minutes.

Though the gunman's face was covered, authorities developed a sketch of him based on witness descriptions and released it Tuesday night. Police also released pictures of two vehicles similar to the ones they're seeking in connection with the incident.

Police said the gunman entered the bank while one customer and three employees were inside. Though no one resisted, the gunman went over the teller counter and shot Shuffield, police said.

After Shuffield was shot, witnesses told police, the robber grabbed cash from some drawers and fired a bullet at an empty chair before exiting the bank. A block to the west, at least one person saw him enter the passenger side of a gold, late-model Dodge Intrepid with dull, worn paint, police said.

The Intrepid sped away and a new, bright blue Honda Pilot SUV followed, the witness said, prompting police to wonder whether the SUV's occupants were linked to the robber. Information about how much money the robber took wasn't available.

Witnesses described the shooter as black, 6 feet 2 inches tall and weighing about 215 pounds. He was wearing a blue stocking cap, a dark face covering, a gray jacket, blue jeans and dark shoes with light-colored heels, witnesses told police. Police said he also wore sunglasses and teal surgical gloves and was carrying a 9 mm gun.

Descriptions of the Intrepid's driver and the Honda SUV's occupant or occupants weren't available.

Part Of Bank Reopens Wednesday

The bank's drive-though window was open for business Wednesday, though customers were not allowed in the lobby. Inside, a security guard kept a watchful eye, Rinehart reported.

According to the victim's neighbors and friends, Shuffield had been trying for five years to get pregnant.

"I hope everything turns out OK for her because she's a really sweet person," one neighbor said.

Indianapolis police vowed to commit whatever resources and officers necessary to capture those responsible for the shooting.

"We're getting quite a few tips," Indianapolis police Detective Dennis May said. "A lot of people driving by the scene yesterday were kind of cheering the officers on. I think the public is really outraged at this whole situation."

A benefit fund for Shuffield was established. Donations can be made to:

Katherin Shuffield Benefit Fund
c/o Huntington Bank, Attn: Main Office Branch
45 N. Pennsylvania St.
Indianapolis, IN 46204