Reuters: Saudi Arabia issued no public warnings before four attacks at Riyadh airport that killed at least 18 people and injured more than 300. The authorities did not explain the silence. Two officials said Saudi authorities had told the Western-allied government that the alerts had been stopped because they were disrupting residents' sleep. Saudi officials did not respond to requests for comment. Public threat alerts were renewed on Monday, October 12, for the first time since September 29. Reuters could not determine whether the airport attacks led to their return.