DENVER We d . August 27th - There were some tense moments at the Unconventional Denver convergence space Wednesday morning when police set up a perimeter around it and attempted to enter and search the building . Security at the space demanded a search warrant when police asked to enter the space . Legal aid was called to the scene immediately where video and written accounts were taken . Police were unable to obtain a warrant and left after some time , but not before arresting 2 activists outside the center .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason the police left ?
Options:
- They interviewed officials .
 - None of the above choices .
 - They could n't find anything .
 - They did n't have a warrant .


They did n't have a warrant .