CRI听力:UK, US Stepping up Efforts against IS Sympathizers

"But there are always lessons to learn on this occasion. I suspect the lessons will be not just that we can tighten arrangements on aero planes and at our borders but also we all have a responsibility - schools, parents, families, communities, universities, colleges - all have a responsibility to fight this poisonous radicalization of young people's minds."

British security services estimate around 600 people from the UK have journeyed to Syria or Iraq to join the militants.

Meanwhile in New York City, officials there are working with the FBI after three men were charged with conspiring to support the Islamic State.

The trio, two from Uzbekistan and one from Kazakhstan, live in Brooklyn.

One of them was arrested at JFK Airport while attempting to board a flight to Turkey.

It's believed he was on his way to join the militants in Syria.

Another posted messages on the Internet, expressing the hope of joining the extremist group.

He reportedly posted messages saying he was willing to kill U.S. President Barack Obama if asked.

A number of others in the US have been charged recently with conspiring to support the Islamic State.

A law enforcement official says there are currently Islamic State-related investigations taking place in all 50 US states.