arrant for her arrest was previously issued, but she remains on the run, he said.

Xuan's attorney, Mitchell Krems, said:  My client is innocent. It is the nanny's wrongdoing who went on the run. He is being targeted for exercising his constitutional right to have a large family. 

Melissa Brisman, an attorney for two of the surrogates involved in the case, told CBS News,  This is wonderful news that people will be held responsible for their actions and there will be consequences if you abuse the surrogacy system. 

Brisman added that it's important surrogacy remains an option for those who need the help to become parents, but said there must  be adequate protections for those who enter the surrogacy system. 

 We need to make sure bad actors don't ruin it for everyone else,  she said.

A Los Angeles FBI spokesperson confirmed the FBI served a search warrant at the home, separate from a search conducted by the sheriff's department.

A neighbor said helicopters and police could be seen at their mansion and the entire block is taped off.

In early September, the Arcadia Police Department requested assistance from the LA County Sheriff's Department, officials said Tuesday.

 We will continue to work together to pursue justice for all 21 children involved in this case,  Luna said.

Maria Castellanos, a surrogate who carried two children for Zhang and Xuan, said after learning of their arrest,  I'm mad that everyone involved couldn't stop this so the kids wouldn't go through everything they went through. I'm just mad with the whole process, the whole thing. It's not just them. 

 I trusted Silvia,  she said.