A blast near a UNESCO world heritage site in Yemen's capital city of Sanaa was caused by a Houthi missile and not a US airstrike, according to the US military. The Houthi-run health ministry reported a dozen people killed in the incident. The US military has been intensifying strikes on Yemen, targeting Iran-backed Houthi rebels. Recent strikes have resulted in dozens of deaths, raising concerns about civilian casualties. Rights advocates have called for accountability for the loss of civilian lives.