Order the dispersion of all persons present at the place of any riot,
rout or unlawful assembly in order to protect the public health, safety
or welfare threatened by the local emergency and to prohibit the gathering
of two or more persons who may, acting together, threaten to use force
or violence, use force or violence, or disturb the public peace. The
orders to disperse persons or prohibit gatherings of person shall
not remain in effect for a period of more than seven days, unless
otherwise approved by the city council;