A South Boston housing development has seen more than its share of gun violence this summer, with a shooting Monday night leaving a 15-year-old boy critically wounded and residents reeling from what they say has become a regular occurrence.

“That’s been kind of a hot spot this summer,’’ Mayor Martin J. Walsh said of the Mary Ellen McCormack development, where the boy was shot just before midnight while sitting in a car near 24 Gavin Way. A woman was shot at the development in July but survived.

No arrests have been made in Monday’s shooting, and the victim has not been identified. Police said he was in critical condition but expected to survive.

“Right now it’s every night, disorder, disorder,’’ said Carlos Marrero, 46, who lives at 24 Gavin Way. “I’m scared to go out of my apartment. This street has a problem.’’

He and his 19-year-old daughter spent the night sleeping on the floor, Marrero said, because he worried about bullets flying through the window.

City and housing officials say they understand that residents are worried. They are collaborating to bring tighter security measures to the development.

Meanwhile, gun violence across the city has fallen compared with last summer. There were 28 fatal and nonfatal shootings in July this year, police said, compared with 42 in July last year. There was one homicide last month, five fewer than in July 2015.

Bill McGonagle, administrator of the Boston Housing Authority, said he and Walsh have discussed installing security cameras along Gavin Way, as well as nearby Logan Way and Sterling Square.

“It’s been a difficult summer,’’ he said. “People are concerned, and we want to make sure that we’re responding to those concerns.’’

McGonagle said he hopes the cameras will be installed by the start of next year, and he estimated they will cost between $500,000 and $600,000.

The housing authority has taken other steps recently to enhance safety. It installed exterior lighting throughout the development last year.

The Boston Police Department has also stepped up its presence. The Mary Ellen McCormack development has a fixed patrol for the first time this summer, meaning that officers are on site 24 hours a day, McGonagle said. The housing authority also has its own security force with about 20 officers.

Hours after the shooting, which was reported around 11:40 p.m. Monday, neighbors were still on edge.

Marrero said he wishes the police presence were more consistent and not just increased during times of violence.

Another woman in the same building, who asked not to be identified, said her children and grandchildren have all asked her to move out.

“My daughter told me, this is the end,’’ she said.

Neighbors were unable to identify the victim by name but said they had often seen him riding his bike around the development. Eneza Rivera, who lives next door to the building where the shooting occurred, said the teen would often wave to her as he rode by.

McGonagle, who grew up in the Mary Ellen McCormack development, echoed residents’ shock about the young age of the victim.

“As a 15-year-old boy, I spent many a summer night on Gavin Way,’’ he said. “Obviously an incident like this — you have a young man, a kid, really — that disturbs people, as it should.’’

John R. Ellement of the Globe staff contributed to this report. Vivian Wang can be reached at vivian.wang@globe.com.