Iranian Foreign Minister Abbas Araghchi (L) and Iraqi Foreign Minister Fuad Hussein hold a joint press conference following their meeting at the Ministry of Foreign Affairs in Baghdad, Iraq, on Sunday. Photo by Ceerwan Azeez/EPA

June 28 (UPI) -- The Iranian military launched fresh attacks at U.S. sites in Bahrain and Kuwait on Sunday morning amid an escalation of violence that threatens a fragile peace agreement.

Bahraini and Kuwaiti government sources said each intercepted attacks from Iran, including two ballistic missiles in Kuwait's airspace. Bahrain said one of the strikes damaged a residential building near an international airport, The Guardian reported.

Neither country declared any casualties, The New York Times reported.

The renewed violence came after an Iranian drone struck a Singapore-flagged cargo ship while transiting the Strait of Hormuz on Thursday. The U.S. military accused Iran of also striking a Panama-flagged tanker carrying oil on Saturday.