Three individuals connected to one of the San Bernardino attackers are arrested over alleged wedding fraud.
The brother and sister-in-law of gunman Syed Rizwan Farook were among those held when raids in California.
The person arrested is the better half of Enrique Marquez jr, a friend of Farook who faces charges himself in reference to the deadly attack.
Fourteen individuals were killed when Farook and his better half, Tashfeen Malik, opened fire at a workplace party in Dec.
The killings were elaborated by authorities as the deadliest terror attack on United States of America soil since 9/11.
The 3 arrested are being held on the charges of conspiracy, wedding fraud and untrue testimony charges, officers said.
Mariya Chernykh, a Russian national, is accused of marrying Enrique Marquez in an immigration scam, the United States Department of Justice said during a statement.
Her sister is married to Farook’s brother and all 3 face conspiracy charges connected to the wedding.
The raids on Thursday were conducted at homes within the cities of Corona and Ontario.
Farook and malik were killed hours after the attacks, during a police shoot-out following a automobile chase.
Mr Marquez was arrested earlier this year. He denies plotting coercion and providing the weapons.