VIENNA, April 25: The UN nuclear watchdog pledged on Friday to investigate whether Syria secretly built an atomic reactor with North Korean help but criticised the United States for delaying the release of intelligence.

The United States revealed its intelligence material on Thursday about the suspected Syrian atomic plant, saying it was “nearing operational capability” a month before Israeli warplanes bombed it on Sept 6.

Mohamed ElBaradei, director of the International Atomic Energy Agency, lambasted Israel for the air strike, saying his inspectors should have been able to verify beforehand whether undeclared nuclear activity had been going on.

“In light of (this, I) view the unilateral use of force by Israel as undermining the due process of verification that is at the heart of the non-proliferation regime,” he said.

ElBaradei said the US allegations against Syria, which denied the US charges and accused Washington of involvement in the Israeli air attack, would be investigated with due vigour.

“The agency will treat this information with the seriousness it deserves and will investigate the veracity of the information,” he said in a statement.

But ElBaradei, alluding to the United States, deplored a failure to share intelligence information “in a timely manner” about the project, which Washington said was launched in 2001.

A diplomat close to the Vienna-based agency expressed anger at the delay. “There is a lot of annoyance here about the lateness in the day that the IAEA got this information. Had this been given to the IAEA before this damn bombing, then the world might know the true story,” the diplomat said.

“Even right after the bombing, before the place was totally cleaned up, it would have been easier.”

ElBaradei confirmed Washington had handed over information this week saying a Syrian installation destroyed by an Israeli air strike in September was an unfinished atomic reactor.

The diplomat and analysts said the US disclosure did not amount to proof of an illicit nuclear arms programme since there was no sign of a reprocessing plant needed to convert spent fuel from the plant into bomb-grade plutonium.

“The absence of such facilities gives little confidence that the reactor was part of an active nuclear weapons programme,” David Albright and Paul Brannan of the Institute for Science and International Security said in an email commentary.

“The United States does not have any indication of how Syria would fuel this reactor ... This type of reactor requires a large supply of uranium fuel. (All of this) raises questions about when this reactor could have operated.”

Analysts say the Bush administration chose not to release the intelligence earlier given a risk that it might prompt Syria to retaliate against Israel.

It published the information this week, they said, in the hope that revealing what it believes about suspected Syria-North Korean nuclear cooperation would encourage Pyongyang to come clean about suspected proliferation activities and in turn encourage Congress to support dropping sanctions on North Korea.—Reuters