( CNN ) -- Embattled San Diego Mayor Bob Filner and his representatives were in a closed door mediation with representatives from the city on Monday , while volunteers hoping to oust the mayor continued to collect signatures for a possible recall . The session , which began at 10 a.m. PT ( 1 p.m . ET ) was still in progress Monday afternoon , said a source with direct knowledge of the meeting , which included San Diego City Council President Todd Gloria . The source declined to say what exactly was under discussion . The mediation is the first known meeting of its kind between Filner and the city . The session took place the same day Filner supporters held a `` We Will Not Be Silent '' rally outside City Hall . One day earlier , protesters who want the mayor to step down marched on the same spot . `` There is no excuse for abuse , and there is no excuse for you to stay in power , '' attorney Gloria Allred told the crowd . She attended Sunday 's rally along with some of the women accusing Filner , including one of her clients , 67-year-old Peggy Shannon . So far , 16 women have come forward to say that Filner acted inappropriately , with accusations ranging from one woman 's claim that the mayor gave her `` tush a pat , '' to another 's assertion that he `` put in me what I guess now is the famous headlock . '' Filner 's office has not responded to multiple CNN requests for comment . Last month , he acknowledged he `` failed to fully respect the women who work for me and with me '' and that he was `` embarrassed '' by his actions . But he also said he will be vindicated by `` a full presentation of the facts '' and that he would not step down . The outrage is overwhelming . Roughly 81 percent of city residents want him to resign , according to a poll conducted by CNN affiliate KGTV . Another affilaite , KFMB , reported local radio hosts hired skywriters to spell out `` Surrender Bob '' over areas of the city last week . Armed with clipboards and pens , volunteers hit the streets of San Diego over the weekend to begin collecting signatures for a recall effort . They need more than 101,000 signatures by September 26 . `` We 're going to be everywhere . We 're going to be at sporting events . We 're going to be at street fairs , arts shows -- you name it , we will be out there , '' Dave McCulloch , an organizer , told KFMB on Sunday . Anti-Filner protesters speak . Filner , 70 , was elected mayor in 2012 after 20 years in Congress . His accusers range from a singer at a campaign fundraiser to his former communications director , who called him unfit for office . Shannon was the latest person to accuse Filner . `` Every day that I went to work , I had butterflies in my stomach because I did not know what was going to happen the next time the mayor came by my desk , '' she told reporters last week . `` I have three sons , four grandsons and two great grandsons . As our mayor , you should be -- but are not -- a role model for any of them , '' Shannon said . Filner has rebuffed calls to resign from all nine City Council members and from fellow Democrats , including California 's two U.S. senators . His supporters , which include some labor unions and Latinos , claim Filner is being denied due process , and the recall effort is orchestrated by those who oppose his political agenda . The mayor entered a two-week intensive behavior therapy program July 29 , but his attorney , James Payne , said he was able to complete the voluntary program August 10 . He was expected to continue with outpatient treatment , Payne said . `` Mayor Filner is taking personal time this week and is unavailable for comment , and we do not have information as to when he will be available for comment , '' said last week 's statement from Payne 's office , adding that it was not able to comment on the recall effort or other allegations leveled against the mayor . Filner is expected to return to work this week , but Payne did not immediately return a CNN e-mail asking exactly when he would be back in the office . The city attorney 's office has said it could seek as a `` last resort '' a restraining order -- saying Filner creates a hostile environment for women -- to prevent him from returning to work , the Los Angeles Times reported . The city attorney 's office did not return calls seeking comment . Though the city chief of staff changed the locks on Filner 's office , it was to preserve evidence rather than to keep him out , the city attorney 's office has said . CNN 's Kyung Lah , Matt Smith and Eliott C. McLaughlin contributed to this report .
City Council members , Mayor Bob Barr , others in mediation meeting , source unknown . Brown 's supporters hold ` ` We Will Not Be Silent '' rally Monday . Recall organizers need to collect more than 100 signatures by September 26 . At least two women have accused Brown of inappropriate behavior .