Security officials are warning the leaders of major Wall Street banks that al Qaeda terrorists in Yemen may be trying to plan attacks against those financial institutions or their leading executives.

Intelligence officials stress the threats are general in nature and there is "no indication of a targeted assassination plot" against any Wall Street executive. But NBCNewYork.com has learned officials fear the names of some top banking executives have been discussed by terror operatives overseas.

Intelligence analysts added they have a general but growing concern that operatives in Yemen may again try to send package bombs or biological or chemical agents through the mail to Wall Street bankers.

In recent weeks, the FBI' Joint Terrorism Task Force and NYPD officials have been briefing bank executives and their security departments on the nature of the threat information. Much of it gleaned from al Qaeda writings like 'Inspire' magazine that recently warned of attacks targeting financial institutions.