An officer with probable cause to believe that an offense occurred may arrest without a warrant a person who

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Warrantless arrests are allowed when the officer has probable cause and the circumstances show immediate need or the suspect is located after the crime. If the offense was committed in the officer’s presence, the officer may arrest without a warrant. If the officer is in the act of witnessing the offense, that ongoing circumstance also authorizes a warrantless arrest. And if the offense has already been committed and the suspect is located, the officer may arrest without a warrant to bring the person into custody. Because each scenario satisfies the condition for acting without a warrant, all of these situations are valid grounds for a warrantless arrest, so the correct understanding is that all of the above apply.