The Alabama Law Enforcement Agency has updated the number of people injured during the shooting Saturday night to 32.

Police are still investigating the incident and are trying to "solidify a motive and potential suspects," the ALEA said.

-ABC News' Matt Foster

Vice President Kamala Harris tweeted Monday that "enough is enough" in the wake of "another senseless mass shooting," and called on state and federal legislators to "step up and act."

"Parents shouldn't have to pray their babies come home same from school or a birthday party," Harris tweeted. "The majority of Americans, including gun owners, support commonsense gun safety laws. We need leaders in state houses and Congress with the courage to step up and act."

Tallapoosa County Coroner Mike Knox has identified the four people declared dead from Saturday night's shooting: 23-year-old Corbin Dahmontrey Holston, 19-year-old Marsiah Emmanuel Collins, 18-year-old Philstavious Dowdell and 17-year-old Shaunkivia Nicole Smith.

Dowdell and Smith were both seniors at Dadeville High School.

-ABC News' Will McDuffie

The Dadeville Police Department has "solid leads" as they search for the suspected shooter, but authorities still need help from the public, Dadeville Police Chief Jonathan Floyd told ABC News on Monday.

Floyd asked anyone with photos or videos from Saturday night's sweet 16 party to come forward.

Due to the department's manpower and resources, Floyd said the Alabama State Bureau of Investigations is taking the lead with the investigation.

-ABC News' Elwyn Lopez

At least 15 people were treated for gunshot wounds at hospitals following a shooting that killed four others at a "sweet 16" birthday party in Dadeville, Alabama, officials said.

Five of the victims were in critical condition Sunday afternoon, Heidi Smith, a spokesperson for Lake Community Hospital told ABC News. Authorities later said at least 28 people were injured.

Smith said at least 15 people were initially treated at Lake Community Hospital, all suffering from gunshot wounds.

Smith said nine of the patients were in higher need of care and some were transferred to other medical facilities. Five of the patients were in critical condition, while four were in stable condition.

The ages of those hospitalized were not immediately released.

Three of the injured victims were transferred to Baptist Medical Center in Montgomery, one was transferred to Children's Hospital in Birmingham and another was moved to the University of Alabama Hospital in Birmingham, Smith said. One patient was transferred to Piedmont Hospital in Piedmont, Alabama, Smith said.

-ABC News' Elwyn Lopez