President Barack Obama reiterated that he would veto any effort by lawmakers to increase sanctions on Iran while the United States and other Western powers were in diplomatic talks with Tehran over its nuclear program.
"The sanctions that we put in place helped make this opportunity possible," Obama said, according to the text of his State of the Union address, referring to diplomatic talks.
"But let me be clear: if this Congress sends me a new sanctions bill now that threatens to derail these talks, I will veto it. For the sake of our national security, we must give diplomacy a chance to succeed."
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Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.
Rebel-held east remains at risk while the pumping station supplying the western part of the city is once again in operation.