Context: 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 .

Question: What may have happened before the police left ?
Options:
0. They arrested three protesters .
1. None of the above choices .
2. The tried to get into the building .
3. They searched the building .
Answer: 2

Question: What may be the reason the police left ?
Options:
0. They interviewed officials .
1. None of the above choices .
2. They could n't find anything .
3. They did n't have a warrant .
Answer: 3