Is this why there were arrests: it is prohibited to interfere with any person who is seeking to exercise first amendment rights of religious freedom at a place of religious worship?
"Freedom of Access to Clinic Entrances Act of 1994
Amends the Federal criminal code to
prohibit: (2) intentionally injuring, intimidating, or
interfering with, or attempting to injure, intimidate, or interfere,
any person by force, threat of force, or physical obstruction exercising or
seeking to exercise the First Amendment right of religious freedom at a place of religious worship"