There's at least 8,500 people in the "migrant caravan" on the US southern border, and at least 600 are convicted criminals.

That's the official word from the top Homeland Security official, Kirstjen Nielsen:

We cannot confirm the backgrounds and identities of all caravan members which possess a national security and public safety risk to our country. However, at this point we have confirmed that there are over 600 convicted criminals traveling with the caravan flow. This includes individuals known to law enforcement for assault, battery, drug crimes, burglary, rape, child abuse and more. This is serious.

Here's the full statement from Nielsen posted on the DHS Facebook page:

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