(Updated) The insanity can appear anywhere

 From ABCNews -

Armed standoff with police shuts down part of I-95

WAKEFIELD, Mass. -- A group of heavily-armed men are engaged in an ongoing standoff Saturday with Massachusetts police, prompting shelter-in-place orders in some areas and sparking massive delays on the holiday weekend as a portion of Interstate 95 remains shut down.

Note: I-95 runs from Miami north to Canada.  In Massachusetts, it goes through the eastern part of the state.

This is a bit surprising because places like Alabama, or even Arizona, are known for sovereign citizen groups, not Massachusetts.

Update on 7/3/2021 to add:

From CNN -

Massachusetts police standoff with heavily armed men ends in 11 arrests

(CNN)A standoff overnight between Massachusetts State Police and "several heavily armed men" in the woods ended Saturday morning with 11 arrests, authorities said.

The ordeal, which started during a police traffic stop, led to the shutdown of part of Interstate 95 and a shelter-in-place order for the surrounding area on a busy holiday weekend, police said.

[snip]

The men were wearing what Mason described as tactical vests and military style uniforms, along with body cameras, and they were carrying a mixture of long rifles and pistols. The men indicated they were traveling from Rhode Island for "training," according to Mason.

Update2 on 7/4/2021 to add:

From The Boston Globe -

Police name men arrested, charges in I-95 standoff in Wakefield

[snip]

According to state police:

The defendants are identified as follows (two of the defendants continue to refuse to identify themselves),

1. JAMHAL TAVON SANDERS LATIMER, a.k.a. JAMHAL TALIB ABDULLAH BEY, 29, of Providence, R.I.;
2. ROBERT RODRIGUEZ, 21, of the Bronx, New York;
3. WILFREDO HERNANDEZ, a.k.a. WILL MUSA, 23, of the Bronx, New York;
4. ALBAN EL CURRAUGH, 27, of the Bronx, New York;
5. AARON LAMONT JOHNSON, a.k.a. TARRIF SHARIF BEY, 29, of Detroit, Mich.;
6. QUINN CUMBERLANDER, 40, of Pawtucket, R.I.;
7. LAMAR DOW, 34, of the Bronx, New York;
8. CONRAD PIERRE, 29, of Baldwin, New York;
9. A male juvenile, age 17;
10. John Doe #1, refusing to identify self;
11. John Doe #2, refusing to identify self.

All suspects are charged with the following offenses:

1. Unlawful possession of a firearm, eight counts;
2. Unlawful possession of ammunition;
3. Use of body armor in commission of a crime;
4. Possession of a high capacity magazine;
5. Improper storage of firearms in a vehicle; and
6. Conspiracy to commit a crime.

Additionally, HERNANDEZ, JOHNSON, DOW, and the juvenile male are charged with furnishing a false name to police.