A bus plunged off a highway bridge into a polluted ravine in Guatemala City on Monday, resulting in at least 30 fatalities and trapping several survivors, according to a spokesperson for the city’s fire department.

The accident occurred on a busy route leading in and out of the city when the bus fell approximately 20 meters from Puente Belice, a highway bridge spanning a road and creek.

Images released by the fire department on social media depicted the bus partially submerged in wastewater, with victims’ bodies scattered around the scene.

In response to the tragedy, Guatemalan President Bernardo Arevalo declared three days of national mourning and mobilized the army and disaster response teams to aid in rescue operations.

“My heart goes out to the families of the victims who woke up to this devastating news. Their pain is my pain,” Arevalo expressed on social media.