The nation recently took time out to remember the 13thanniversary of the 9/11 attacks that occured in 2001 in New YorkCity, Washington and Pennsylvania.

And, while this is never part of the recognition of that day,it's worth noting for our purposes in the P&C industry thatthose attacks were the most expensive terrorist attacks of all timein terms of insured losses, producing losses of about $32.5 billion($42.9 billion in 2013 dollars). This was the largest insuranceloss in global history at the time and losses were paid out acrossa variety of lines, including property, business interrupton,aviation, workers compensation, life and liability.

As Congress continues to delay renewal of the federalTerrorism Risk Insurance Program Reauthorization Act (TRIPRA), it'sa good time to consider the continuing risk of terrorist-relatedlosses, due to new threats from extremist groups like ISIS andothers.

“The 13-year anniversary of the September 11, 2001, terroristattack—coming just ahead of TRIPRA's looming December 31 expirationdate—is a reminder of the urgent need for Congress to swiftlyreauthorize this vital Act, which has proven itself to be acritical component of the country's national economic securityinfrastructure,” said Dr. Robert Hartwig, CPCU, economist andpresident of the Insurance Information Institute (I.I.I.) in astatement last week. “Moreover, recent and explicit threats toAmerican interests around the world from new terroristorganizations, including Islamic State (ISIS), demonstrate that theneed for the program is greater than at any time in the pastseveral years.”

But 9/11 isn't the only example. Here are the top 10 mostexpensive terrorist acts of all time, ranked in terms of insuredlosses (all losses in 2013 dollars). Source: I.I.I.

Sept. 12, 1970

Zerqa, Jordan

Hijacked Swissair DC-8, TWA Boeing 707, BOAC VC-10 dynamited onthe ground.

Insured property loss: $167M

Fatalities: 0

April 19, 1995

Oklahoma City, OK

Bombing of the federal building in downtown Oklahoma City.

Insured property losses: $192M

Fatalities: 166

June 23, 1985

Over the North Atlantic

Bomb explodes on board an Air India Boeing 747.

Insured property losses: $212M

Fatalities: 329

Feb. 9, 1996

London, UK

IRA bomb explodes in the city's South Quay Docklands area.

Insured property losses: $341M

Fatalities: 2

July 24, 2001

Colombo, Sri Lanka

Rebels destroy 3 airliners, 8 military aircraft and heavilydamage 3 civilian aircraft.

Insured property losses: $525M

Fatalities: 20

Feb. 26, 1993

New York, NY

Bomb explodes in the garage of the World Trade Center.

Insured property losses: $822M

Fatalities: 6

April 10, 1992

London, UK

Bomb explodes in London's financial district.

Insured property losses: $883M

Fatalities: 3

June 15, 1996

Manchester, UK

Irish Republican Army (IRA) car bomb explodes near a shoppingmall.

Insured property losses: $980M

Fatalities: 0

April 24, 1993

London, UK

Bomb explodes near NatWest tower in the financial district.

Insured property losses: $1.2B

Fatalities: 1

Sept. 11, 2001

New York, NY; Washington, DC; Pennsylvania

Hijacked airliners crash into the World Trade Center, Pentagonand a rural area in Pennsylvania.

Insured property losses: $24.7B

Fatalities: 2,982