The situation is tense near the state Capitol where hundreds of Occupy Denver protesters have gathered.
Police warned about 3 a.m. that they would start clearing the park and protesters are expecting police action any minute.
Squad cars have parked along the park but so far there has been no further activity.
Earler, authorities gave an 11 p.m. Thursday deadline to clear the park, but protesters stayed put.
State Patrol Chief James Wolfinbarger had said troopers could issue citations or make arrests between 11 p.m. and 5 a.m.