A Los Angeles school district is demanding an investigation of an incident last month, during which Immigration and Customs Enforcement (Ice) agents gathered at a local high school before a raid and were seen publicly urinating on school grounds, not far from where elementary school students were attending summer classes.

According to a statement from El Rancho unified school district, which also released video evidence in the form of surveillance-camera footage, the incident took place on the morning of 17 June at Ruben Salazar high school in Pico Rivera, in south-eastern LA county.

The school has since written to Kristi Noem, the US homeland security secretary, to request an inquiry. “At no time was a legal or legitimate reason offered or provided as to why ICE agents entered and remained on school grounds, nor did they provide any judicial warrant,” the school district said in the statement.