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 .

Based on the preceding passage, choose your answer for question What may have happened before the police left ?
OPT:
(1). They arrested three protesters .
(2). None of the above choices .
(3). The tried to get into the building .
(4). They searched the building .
The answer is:
(3).