BEIRUT — Saudi Arabia has arrested 93 people accused of plotting terrorist attacks since December, including a group described as having sought to strike the United States Embassy with a car bomb, the Saudi Interior Ministry said on Tuesday.

The ministry said in an statement that the suspects were accused of recruiting and training new members; testing explosives; gathering firearms; and plotting to attack residential areas and security facilities. They were arrested in six groups, it said, adding that most of the suspects had ties to the Islamic State extremist group and nearly all were Saudi citizens. One of the 93 suspects is a woman.

Saudi Arabia has joined an American-led coalition that is bombing the Islamic State, also known as ISIS and ISIL, in Iraq and Syria, where the group has seized territory. The Saudis are also leading an Arab coalition carrying out airstrikes in Yemen.

For their part, the Islamic State’s leaders have called on their supporters to mount attacks inside Saudi Arabia. There have been a series of mainly small-scale attacks in recent months.