Market sources report a car explosion in St. Petersburg, Russia.

Moderna(MRNA.O)美股盘前跌幅扩大至8%。

President Trump said he is "not at all concerned" about Russia potentially taking military action against NATO. The remarks followed a secret visit to Moscow by CIA Director John Ratcliffe, who met SVR chief Sergey Naryshkin. Several media outlets reported the trip was intended to warn Russia not to attack NATO; Trump denied that, calling the visit "routine" and saying "no messages were conveyed" and "nothing unusual" occurred. Naryshkin described the talks as routine and focused on intelligence matters. The meeting, Ratcliffe's first trip to Russia since taking office, comes amid rising European concern that Russia may be probing NATO's collective-defense commitments.