A former Israeli government minister, once imprisoned for trying to smuggle drugs, is back behind bars after being charged with spying for archenemy Iran, the country's internal security agency said Monday.

The Shin Bet, the Israeli security agency, said Gonen Segev was extradited from Guinea and arrested upon arrival in Israel last month on suspicion of "committing offenses of assisting the enemy in war and spying against the state of Israel."

It said Mr Segev, a former energy minister, acted as an agent for Iranian intelligence and relayed information "connected to the energy market and security sites in Israel including buildings and officials in political and security organizations."

Lawyers representing Mr Segev issued a statement that did not reject or accept the accusations, only saying that the indictment "portrays a different picture" than what the Shin Bet says.

Mr Segev, who served in the Cabinet under Prime Minister Yitzhak Rabin in the mid-1990s, was arrested in 2004 for attempting to smuggle 32,000 Ecstasy tablets from the Netherlands to Israel using an expired diplomatic passport.