Police say Antwan Cox and Smith opened fire on Arthur and Harper, and both officers fired back. Arthur was shot in the jaw and the cheek. Bealefeld said Harper, a three-year veteran of the force, exhibited "a great deal of heroism" in continuing to fire as he assisted his wounded partner.
Smith was found inside 550 Orchard St., with a .357 magnum revolver believed to have been used in the shooting and a 9 mm semiautomatic handgun, police say. He had a gunshot wound in the left calf.
Police say Antwan Cox was arrested after he sought treatment at Maryland General Hospital for a gunshot wound to the right leg. Bealefeld declined to give details of the arrest of Sean Cox. Police have not determined whether the two are related.
Arthur remained conscious until he was placed under anesthesia for treatment at Shock Trauma, police say. Police union President Robert F. Cherry said yesterday that Arthur's "spirits were good."
"It was a bad night, but there is good news," Cherry said. "The officer is going to be fine. When we left around 3 in the morning he was still in surgery. Dr. [James] O'Connor" - the director of thoracic and vascular surgery at Shock Trauma - "is confident he's going to make a full recovery."
Cherry said one bullet shattered Arthur's jaw and some teeth, and that the other grazed a cheek.
Listed on the National Register of Historic Places, Seton Hill combines some of the city's oldest rowhouses with the troubled housing complex where neighbors say dealers run an open-air drug market.
Seton Hill Association President Karen French has counted at least four murders in the neighborhood since she moved there 11 years ago. After years of meetings with representatives of the mayor's office, police and Orchard Mews yielded "few if no results," she said, the association recently hired a lawyer.
"It just seems that the wheels move slowly, and we have to live with it," she said.
City Councilman William H. Cole IV blamed the management at Orchard Mews.
"I can say Central District has certainly put plenty of resources up there, as evidenced by the fact that there were undercover officers there," he said. "In my mind, the apartment complex is not taking its responsibility to run a secure business seriously."
Cole said complex management has promised security guards, cameras and better lighting.
Security cameras were visible at the complex yesterday, but neighbors said they didn't work. Property manager Melva Smith declined to say whether the complex had hired security. She expressed frustration that critics don't want to help pay for security improvements.
"It seems like they want us to fit the bill outright," Smith said. "It doesn't seem like they want to be in a partnership."
Baltimore Sun reporter Nicole Fuller contributed to this article.