Mexico's top police official won't say which cartel may have been involved in the brazen assault, which included a diversionary attack with an assault rifle against police outside the mall.
"There are links to Mexican criminal organizations, mainly (for) money laundering," Public Safety Secretary Alfonso Durazo said Friday.
The two Israelis, one of whom was a well-known felon who had spent many years in Israeli prison, were shot dead and two others, including a local police officer, were wounded during the shooting at Hunan restaurant.
The police have the murder suspect - identified as 33-year old Esperanza Gutiérrez Rojano - in custody. She reportedly donned a blond wig disguise for the shooting.
Though she initially claimed the killings were a crime of passion, prosecutors say she later changed her story.
Initial findings of the investigation show that Rojano sat in the restaurant a few meters away from the Israeli victims and shot them both in the back, causing panic among the patrons.
She told police that she had purchased the murder weapon for 7,000 Mexican Pesos (approx. $368).