An Israel court on Monday remanded in custody for eight days an alleged Iranian spy, arrested on September 11 carrying photographs of the US embassy in Tel Aviv.

An AFP cameraman at the court said that in his first appearance Ali Mansouri, 58, was silent and motionless as he sat in handcuffs, wearing a brown prison uniform.

He has yet to be charged.

News of his arrest was made public on Sunday, just hours after Israeli Prime Minister Benjamin Netanyahu left for Washington and New York, determined to expose what he described as "sweet talk" by Israel's arch-foe Iran.

Israeli media quoted a police representative as telling the magistrates court in Petah Tikvah, near Tel Aviv, that the decision to ask for the lifting of a gag order on the arrest was made at "a high level."

Israel's Shin Bet security service says that Mansouri, who holds a Belgian passport, was sent to Israel by Iran's elite Republican Guards and arrested at Tel Aviv's Ben Gurion international airport.

The domestic intelligence service, directly responsible to Netanyahu's office, said in a statement on Sunday that Mansouri had enrolled in a "special operations unit of the Revolutionary Guards responsible for numerous terrorist attacks around the world".

He had been using the alias Alex Mans after being recruited last year, the agency said, naming his four alleged handlers as senior Iranian officials.

The Shin Bet said that under questioning, the suspect had said he had been promised $1 million to use his position as a businessman to set up companies in Israel on behalf of the Iranian intelligence services to "harm Israeli and Western interests".

He had previously visited Israel in July 2012 and last January. An Iranian national, the suspect had in 2006 married a Belgian woman whom he had since divorced.

Netanyahu, due to meet US President Barack Obama at the White House on Monday, has been dismissive in his response to the drive by Iran's new President Hassan Rouhani to mend fences with the international community, which culminated in a historic 15-minute telephone conversation with Obama on Friday.

Israel, the Middle East's sole if undeclared nuclear-armed power, remains adamant that Iran is bent on developing a nuclear weapons capability, something it regards as a threat to its existence.

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