TEHRAN — Turning up the heat in an already tense standoff, several Iranian officials on Tuesday renewed accusations against Saudi Arabia, suggesting that the Persian Gulf kingdom was behind last week’s twin terrorist attacks in Tehran.

Iran’s most influential military figure, Maj. Gen. Mohammed Ali Jafari, the commander in chief of the Revolutionary Guards Corps, told the semiofficial Fars news agency that Iran had “precise information” that Saudi Arabia “has asked terrorists to carry out operations in Iran.”

He offered no further details.

The deputy chief of staff of Iran’s armed forces, Brig. Gen. Masoud Jazayeria, a hard-liner, made similar assertions against Saudi Arabia, accusing the Saudis of “governmental terrorism.”

Other officials have echoed those remarks.

In the episode last Wednesday, the Parliament building and the shrine of the founder of the Islamic republic, Ayatollah Ruhollah Khomeini, were attacked simultaneously. The Islamic State claimed responsibility for the assaults, which killed 17 people and wounded dozens. All but one of the attackers were Iranian Kurds.