From https://www.mymcmedia.org/tag/... (Montgomery Community Media)
* (Sept 3, 2019 ) POLICE SAY VIRGINIA MAN CHARGED WITH RAPE MAY HAVE MORE VICTIMS
* (April 16, 2019 ) MCPS HIRES EXTERNAL FIRM TO INVESTIGATE DAMASCUS SEXUAL ASSAULT CASE
* (April 12, 2019) POLICE SAY NORTH BETHESDA MAN CHARGED WITH RAPE MAY HAVE MORE VICTIMS
So, on a local news outlet - on a page specifically related to sexual assault, the top three most recent news stores span approximately twenty one weeks and there is no mention of MS13, sanctuary city criminal illegal aliens etc... The three stories deal with US residents, a Virginia resident, members of athletic teams at a local high school in Maryland, and another man from North Bethesda, MD.
Not an auspicious start to back up your claims...
Washington Post
* (Aug 22, 2019) TWO MARYLAND MEN INDICTED IN RAPE OF 11-YEAR OLD GIRL
Disgusting and disturbing, but not a mention of MS13 or criminal illegal immigrants.
WTOP.com (https://wtop.com/montgomery-county/2019/04/woman-sexually-assaulted-after-getting-off-bus-in-montgomery-co/) Washington's Top News
* (April 23, 2019) A story about a while male suspect in his twenties.
Here's the fourth Google result. It, also, does nothing to verify your claims
http://www.mymcpnews.com/categ...
After that Google goes down to links for sites that provide services and assistance. None of the local news sites had anything related to your assertions.
The top four Google results for "Sexual Assault Montgomery County MD" don't come even remotely close to providing any information to back up your statements. Other than two incidents in late August the most recent other incidents are from five months ago. The suspects are all either US residents or white males or high schools students. There is no mention of issues with the sanctuary city rules, MS13 gang affiliation, or anything else you have asserted.