Those who suspect suspicious activity were urged to contact local law enforcement, fire departments, or the Los Angeles County Fire Department's Public Affairs Section at (323) 881-2411.
Police added it was unlikely she was working alone given the number of suspected suspicious deaths.
According to a recent audit of the program, 30% of the people suspected of "suspicious activity" and slated for further counterterrorism investigation at "fusion centers" - which are government-run warehouses of intelligence gathering, storing and sharing - are black.
The government offers no guidelines, except to decree that depository financial institutions report "any instances of known or suspected illegal or suspicious activity".
"If you look at how it's written, it says that if someone is abroad in a public place, a police officer sees suspicious activity and he suspects that crime is about to happen, is happening or has happened, he can intervene," Kelly said.
They reported suspicious activity on their phones and suspected they might have been victims of phone hacking done by News of the World.
The act requires banks to file suspicious activity reports when they "detect certain known or suspected violations of federal law or suspicious transactions".
Last year 267 reports were received about suspicious activity on Facebook, 43% of which related to cases of suspected grooming.
The suspects were arrested near 10th Street and West Balboa Boulevard after a resident who spotted suspicious activity called police.
Lynch called for Americans to report suspicious activity to law enforcement, explaining that in previous attacks, people around the suspects often picked up on clues.
A suspicious activity report, or Sar, is information designed to tip off law enforcement agencies if a bank or another financial organisation suspects a transaction may be linked to money laundering, the proceeds of crime, or "terrorist financing".
