The bodies of two men were recovered from Lake Ray Hubbard Friday morning after the pair went missing on July 4.

Jason Evans, a Dallas Fire-Rescue spokesperson, said 911 callers reported that multiple swimmers had jumped off a boat into the lake, but two did not resurface, per CBS News Texas. The two missing men were both in their 30s.

Police, DFR, and the Texas Game Warden’s office responded to the scene around 8 p.m. on Thursday near Windsurf Bay Park, in the southwest portion of the lake. Crews searched for the two victims until late in the evening, when the search was suspended. The search resumed early Friday morning, and members of the Dallas Police Department dive team found the bodies just before 8 a.m. The names of the victims have not yet been released.

Police noted that this is an ongoing investigation.

In June, a 27-year-old man drowned in Lewisville Lake after similarly jumping off a boat, per Fox 4 KDFW. His body was found roughly 25 feet from the shore after the Lewisville Fire Department Dive team and the Game Warden’s office used sonar to search for the victim.

Less than a week prior to that incident, a 19-year-old swimmer drowned in Lewisville Lake when he swam after an inflatable that had floated away.

In September, the body of a 15-year-old boy was recovered in Lake Ray Hubbard after being taken away by a wave, CBS reported. The family had rented a boat for the evening, and the boy was swimming nearby without a life vest when he was hit by a large wave. Two days later, searchers located the body of the drowning victim, Phat Duy Nguyen, near the south end of the lake, CBS News Texas reported.

“There is a common saying among water safety advocates that when everyone is watching, no one is watching,” Adam Katchmarchi, Ph.D. and Executive Director of the National Drowning Prevention Alliance, said in a news release.

The Alliance shared several tips on how to help prevent a drowning incident.

Have a designated, active water watcher at all times:

1. Adult water watchers need to provide close, constant, and capable supervision.

    • Water watchers must stay focused and never be distracted by cell phones, conversations, or other diversions.
    • Water watchers cannot be under the influence of drugs or alcohol.
    • Water watchers should rotate every 15 minutes.

2. Identify weak and non-swimmers and always practice touch supervision by always reaching out and touching non-swimmers.

3. Swim near a lifeguard whenever possible. With an adult water watcher designated, even if lifeguards are present.

4. Enroll your child in high-quality swim lessons as early as their first birthday. But keep in mind that even good swimmers can drown.

5. Do not overly rely on one layer of protection, as layers can break down and are designed to be combined to reduce risk.

6. Learn CPR with rescue breaths and what to do in an emergency.