Federal officials reported Tuesday that a body had clogged the pumps in the Tijuana River intended to prevent polluted water from flowing into the United States.

A cleanup crew in Tijuana discovered the body on Sunday morning trapped in the intake screens along the river channel, which had also become covered with trash, according to Mexican officials.

As a result, roughly 14.5 million gallons of polluted water spilled over the border into the U.S. from Saturday night through Monday, according to the U.S. section of the International Boundary and Water Commission. The flows were a mix of treated and untreated wastewater.

Police officials in Mexico are investigating the death.