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The number of deaths from terrorism increased by 61% between 2012 and 2013, a study into international terrorism says, according to the BBC.

There were nearly 10,000 terrorist attacks in 2013, a 44% increase from the previous year, the Global Terrorism Index 2014 report added.

The report said militant groups Islamic State, al-Qaeda, Boko Haram and the Taliban were behind most of the deaths.

Iraq was the country most affected by terrorism, the report said.

The report by the Institute for Economics and Peace says that nearly 18,000 people died from terrorist attacks in 2013.

"Not only is the intensity of terrorism increasing, its breadth is increasing as well," it notes.

Steve Killelea, IEP executive chairman, told the BBC the latest increase in deaths from terrorism was primarily due to the civil war in Syria, which began in 2011.

"The destabilisation in Syria, which has now overflowed into Iraq, is where we feel the upsurge in terrorism," Mr Killelea said.

The report, which investigates terrorism trends between 2000 and 2013, uses data from the US-based Global Terrorism Database.

It includes rankings of countries by the impact of terrorist activities, based on the number of terrorist attacks, deaths and injuries from terrorism, and damage to property.

Five countries - Iraq, Afghanistan, Pakistan, Nigeria and Syria - accounted for 80% of the deaths from terrorism in 2013. More than 6,000 people died in Iraq alone.

India, Somalia, the Philippines, Yemen and Thailand were the next five, with between 1% and 2.3% of global deaths by terrorism.

Although Organisation for Economic Co-operation and Development (OECD) countries only experienced 5% of all deaths from terrorism since 2000, they suffered some of the deadliest attacks, the report said.

These included the 11 September 2001 attacks on the US, the 2004 Madrid train bombings, the 2005 London bombings, and the bombing and shooting attack in Norway in 2012.

During 2013, Turkey and Mexico were the OECD countries with the highest number of deaths from terrorism, at 57 and 40 respectively.