2:24
Blogger and former police officer John Cardillo told ABC News that the officers who paid for the plane, whose names were not released, arranged for the pilot to fly from central New Jersey up to the Hudson River and along Manhattan this morning.
City Hall spokesman Wiley Norvell condemned the banner, saying: \"Dividing people won't help our city heal.\"
![\"PHOTO:](\"http://a.abcnews.com/images/US/HT_Ramos_Liu1_ml_141220_4x3t_384.jpg\")
Meanwhile, the relatives of the other fallen officer, Wenjian Liu, appeared at a news conference with former New York City Mayor Rudy Giuliani and other supporters of Tunnel to Towers, a charity originally established in the aftermath of the Sept. 11 attacks, which has offered to pay the slain officers' mortgages.
\"We remember the spirit of September 12 and that's what we're asking for today,\" the former mayor, who has donated $20,000 of his own money towards the mortgage cause, said at today's news conference.
Liu's wife, Pei Xia Chen, was overcome with emotion, and though no members of his family spoke at the event, they issued a statement thanking Giuliani and Gov. Andrew Cuomo, who have helped spearhead the effort.
Unrest has followed the shooting, with six people charged with threatening NYPD officers. There have been at least 40 separate threats against New York City police since Saturday’s shooting, the NYPD said Wednesday.
Half of those threats have been deemed not credible. The rest are still under investigation.
“All threats against members of the NYPD are taken seriously and are investigated immediately to determine the credibility and origin of the information,” the department said in a statement.
Extra guards have been posted at precincts when necessary and Mayor Bill de Blasio has implored the public to report any threats they may see online. The NYPD counts about 35,000 uniformed officers, with 22,000 patrolmen.
The Associated Press contributed to this report.
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