Several crafts that look like stars and moving erratically. Appeared to be chasing each other

After departure from McAllen Texas, we began to see several crafts that were moving erratically. I originally thought that it was a landing light of an aircraft, however, the aircraft began to move in all directions, extremely quickly. After the originally sighting, several more aircraft appeared and began shining lights at us. We asked ATC if anything was over there, but they continuously said that nothing was indicating on their radar.