The attack on a military recruiting center and another U.S. military site in Chattanooga on Thursday has left many concerned about the safety and well-being of members of the armed forces throughout the United States.

At least four Marines were killed along with the alleged shooter, who has been identified as 24-year-old Muhammad Youssef Abdulazeez. According to the FBI, Abdulazeez was killed by members of law enforcement. Three other people were also wounded during the attack.

The attack has led to an abundance of caution around New Jersey. Fort Hancock at Sandy Hook was briefly placed on lockdown after the NYPD received an internal memo warning of a report of armed men near Midland Beach in Staten Island.

Most military locations across the country have seen an increase in security in the wake of the attacks. Officials are also warning the public to immediately report any activity deemed suspicious.

Soldiers at a recruitment center in Edison tell News 12 New Jersey they are worried they will be targeted. Weapons are not allowed at recruitment centers. The attack in Tennessee has left some wondering if this should change, as it was armed police officers who stopped Abdulazeez.

"There is absolutely no doubt in my mind that Chattanooga police officers prevented loss of life yesterday," says Chattanooga Police Chief Fred Fletcher.

The attack has been deemed an act of terror. The FBI is still investigating, but believe Abdulazeez acted alone.