LOS ANGELES—Immigrant rights advocates say they will camp out in downtown Los Angeles and fast to demand an end to raids they say are tearing apart families.

Organizer Kai Newkirk said on Wednesday about 100 people are expected to join the fast, which will start on Oct. 15 and last until immigrant rights advocates garner a million signatures for a pledge to support immigrant rights.

Newkirk says tents will be set up at La Placita Olvera in Los Angeles for fasters, who will drink only water.

Several Los Angeles-based immigrant rights groups will help circulate the pledge. Some fasters plan to join for several days, others for longer.

The medically supervised fast was planned by a group of immigrant rights activists who say they are committed to non-violent protest.