han

third-person plural present indicative of haber

sido

past participle of ser

empleados

• Adj

  masculine plural of empleado

• Noun
• Verb

masivos

masculine plural of masivo

en

1. in, at, on
2. in (a time)
3. in (a language)
4. used after some verbs and translated by various prepositions in English
5. in (in various expressions)

los

• Article

  the

• Pron

Estados Unidos

United States (a country in North America)

tiroteos

plural of tiroteo