Update

The US has said it will not hesitate to defend its interests and those of its allies as Iran continues missile tests.

Secretary of State Condoleezza Rice said the US had increased its security in the region and Iran should not be "confused" about US capabilities.

Iran tested missiles on Wednesday that could reach Israel, and on Thursday carried out further tests.

Meanwhile French energy giant Total has said it will not invest in Iran because it is too politically risky.

New tests

Condoleezza Rice was speaking during a visit to Georgia.

She said: "We take very strongly our obligation to defend our allies and we intend to do that.

"In the Gulf area, the United States has enhanced its security capacity, its security presence and we are working closely with all our allies... to make [sure] they are capable of defending themselves."

The Iranian military said on Thursday its Revolutionary Guards had carried out further medium- and long-range missile tests overnight.

The tests included the first night test of the Shahab-3 missile, said to have a range of 2,000km (1,240 miles), along with shore-to-sea, surface-to-surface and sea-to-air missiles, state media reported.

The BBC's Jon Leyne in Tehran says this appears another gesture of defiance following the international condemnation of Wednesday's tests. Media reports appeared to be delivered as a matter of pride.

Ms Rice said it was about time Iran "got on the right side of the international community".

BBC NEWS | Middle East | US warns Iran on missile threat