Jamal al-Marri, deputy police chief, said: "Engineers are at the site and are inspecting the situation."
Several workers were badly injured and rushed to a government hospital, a police officer at the site said.
Most workers in the emirate, witnessing a massive construction boom, come from India.
Two workers were killed and about 60 were injured in January when a fire broke out in a tower block under construction in the city.
Dubai, one of fastest-growing cities in the world, is home to the world's tallest building and building the world's largest theme park.