ME AND MY FRIEND WERE ON THE PARK WHEN A GROUP OF 5 OR 6 LIGHTS APERED SW OF MY POSITION GOING NW AFTER 30 SECONDS ANOTHER 4 LIGHTS APEARED FOLLOWING THE FIRST GROUP.THESE LIGHTS WERE MOVING AT RATHER HIGH SPEED IF COMPARED TO AN AIRPLANE, AND MOVING IN NO APARENT FORMATION AT TIMES THE LIGHTS CAME CLOSER ONE TO ANOTHER AND THE NEXT MOMENT THEY SEPARATE. THE LIGHTS SEEMED TO BE CLIMBING.THE EVENT LASTED AROUND 30 MINS FROM 6.40PM TO 7.10PM (COLOMBIA TIME)DURING THE EVENT I FELT AMAZED BUT FEARLESS OF THE SIGHT. I LOSE CONTACT WITH THE OBJECTS WHEN AS THEY KEPT THEIR PATH ON NW DIRECTION