This is stated on its official page.
"The special envoy in Yemen is deeply concerned about drone attacks on two large oil enterprises in Saudi Arabia ... This military escalation is very alarming," the statement said.
It is noted that Griffiths called on all parties to exercise restraint and prevent the recurrence of such incidents, which pose a serious threat to regional security.
Saudi Arabia’s Interior Ministry said earlier that fires occurred at two refineries in the state-owned Saudi Aramco company after drones attack. In London condemned the attack of drones.