The US says an independent Palestinian state should be established through direct negotiations between Israel and the Palestinian Authority and not through UN action
The blast followed others in Qatif and Jeddah on Monday, the last day of the Muslim holy fasting month of Ramadan and start of the Eid ul-Fitr festival. Pictures circulating on social media showed dark smoke billowing from flames near the mosque.
The Prophet's Mosque is the burial place of the Prophet Muhammad.