Who can do warrantless arest?

Warrantless arrests can typically be made by law enforcement officers when they have probable cause to believe that a crime has been committed, regardless of whether a warrant has been issued. This includes situations where a crime is committed in the officer's presence or when the officer has reliable information that a suspect is committing or has committed a felony. Additionally, certain jurisdictions may allow private citizens to perform warrantless arrests under specific circumstances, but this varies by law.