Five workers were killed and two others were injured on Monday when the boom of a crane fell on them at a construction site in Ecatepec, México state.

The accident occurred at about 9:30 a.m. at a site where an elevated section of road that will be part of a new route to the new Mexico City airport is being built.

The federal Ministry of Communications and Transportation (SCT) said on Twitter that the accident occurred when the boom gave way while lifting reinforcing steel, apparently because the load was too heavy.

The steel fell next to the road where the men were working but didn’t harm anyone or cause damage to vehicles, the SCT said.

Ecatepec Civil Protection chief Victoria Arriaga said the injured workers were taken to the Las Americas Hospital in Ecatepec, a municipality that borders Mexico City and is located about 20 kilometers south of the Santa Lucía Air Force base where the new Mexico City airport is currently under construction. Their injuries were not life threatening.

With reports from Milenio