警方警告公众要警惕那些承诺快速致富的诈骗电话。

The police warned the public to be cautious of phone calls that promise quick riches through ___scamming.

警方正在调查那些利用虚假投资计划诈骗老年人的团伙。

The police are investigating groups ___scamming elderly people with fake investment schemes.