Apple has resisted government demands to allow unlocking of San Bernardino shooter Syed Rizwan Farook's phone.
In a complaint made against Enrique Marquez, federal investigators state Farook left a bag containing explosives in the center. Marquez has been charged on three counts.
Investigators may charge Enrique Marquez on Thursday.
After finding undisclosed objects from the lake, federal investigators are hoping to find the hard drives missing from the terrorist couple's computers.
Authorities are coming around to accept there may have been an intelligence lapse that prevented law enforcement agencies in seeing Malik and Farook for what they were.
Investigators across US and Pakistan are working to gather details about Malik before she participated in the deadly attack that left 14 dead at the Inland Regional Center.
Investigators found amunition and explosives at the couple's house. Farook and his wife Malik left their six-month old infant with Farook's mother before going to the center on Wednesday.
Law enforcement agencies are investigating if Malik, who hails from Pakistan, was the brains behind the attack.
The couple was killed in a shootout with the police on Wednesday.
