Which sentence is the most correct, clear, and concise? 
In our present day and time, on the anniversary of the World Trade Center attack, federal officials have indicated clearly that they have new rules and procedures to prevent another attack of that magnitude.
Today, the anniversary of the World Trade Center attack, federal officials stressed that they have instituted stricter procedures to prevent another attack.
At this moment of the anniversary of the World Trade Center attack, the officials of the federal government forcefully stressed that they have put into place a series of tougher regulations and procedures to prevent another such catastrophic tragedy.
On this day, the anniversary of the World Trade Center attack, the federal government administration put emphasis on the fact that they have new regulations to prevent another such catastrophic tragedy.