Retired New York Police Department Chief John Chell warned that the possibility of sleeper cells operating in the United States remains a serious concern following the recent attack in Austin, Texas, stressing that both law enforcement and civilians must remain vigilant.

Gunman opens fire from moving car in European tourist hot spot, leaving 6 dead and at least 15 wounded
Małopolska Police and MPK S.A. confirmed a Polish gunman opened fire at a popular tourist destination in Kraków Saturday, killing six people and wounding at
