NEW : The United Nations calls on rebels to stop fighting . The rebels occupying the city of Goma , Democratic Republic of Congo , refuse to surrender . African leaders give the rebel group until midnight Tuesday to surrender . The rebels want to talk with Congolese leaders about breaches of a 2009 peace treaty .
NEW : The United Nations calls on rebels to stop fighting . M23 rebels occupying the city of Goma , Democratic Republic of Congo , refuse to leave . African leaders gave the rebel group until midnight Tuesday to withdraw . The rebels want to talk with Congolese president about breaches of a 2009 peace treaty .