Canadian consular officials are pressing for more information from the US government after a Canadian citizen died while in the custody of US Immigration and Customs Enforcement in a Florida detention center this week.

The death of Johnny Noviello, 49, came as ICE agents have made sweeping arrests across the United States as part of President Trump’s crackdown on immigration. The cause is under investigation.

Records of hundreds of emergency calls from ICE detention centers obtained by WIRED—including audio recordings—show a system inundated by life-threatening incidents, delayed treatment, and overcrowding.