(CNN) Shots were fired at U.S. embassy vehicles Thursday night and personnel at the embassy in South Sudan were briefly ordered to shelter in place after gunfire and explosions Friday rocked the capital of Juba, including near the Presidential Palace, State Department officials told CNN.

State Department spokesman John Kirby said the State Department is monitoring the situation closely. All embassy personnel have been accounted for and the embassy is taking "appropriate precautions," Kirby said.

"At this time we do not have information regarding what led to the fighting today. We note that the President, First Vice President, and Vice President were in a meeting as the clashes started. The leaders have assured us of their commitment to resolve the tensions that have escalated in recent days. We are engaging them at the highest levels to urge them to secure an end to violence."

On Thursday night, South Sudanese government security forces fired on two U.S. Embassy vehicles driving on a main road of Juba near the presidential compound, Kirby told CNN.

No one was hurt during the incident, which Kirby attributed to the embassy's use of armored vehicles, along with other security measures.

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