The country is among those targeted most often by terrorists.

A shoot-out erupted in eastern Sri Lanka on Friday night between security forces and suspects linked to the string of suicide bombings that has claimed hundreds of lives.

At least 15 people dead, including several children, after a military raid linked to the Easter Sunday suicide bombing.

James Longman's reporter's notebook from Sri Lanka after attacks.

Governmental factions led to officials missing some warnings ahead of bombings planned for Easter Sunday.

Sri Lankan officials are hunting for more suspects in the deadly bombings, which have led Catholic churches in the area to suspend all public services for fear of more attacks.

Investigators are examining surveillance footage from the moments just before the deadly attacks.

Many of the suicide bombers who took part in Sunday's attacks were highly educated and financially independent, according to Sri Lanka's deputy defense minister.

An analysis of what the terrorist threat from Sri Lanka may really mean.

Officials are looking through surveillance video and asking the public to remain vigilant. ABC News' Elizabeth Hur reports.

The terror group issued a formal statement identifying the seven suicide bombers who detonated explosive-laden vests at churches and hotels, killing over 350 people.

ABC News Chief Global Affairs Correspondent Martha Raddatz reports on questions about the strength of ISIS after it lost territory in the Middle East.

The Islamic State group has claimed responsibility for the wave of coordinated bombings at churches and high-end hotels across Sri Lanka on Easter Sunday.

Sri Lankan officials believe the highly-sophisticated, coordinated bombings on Easter Sunday were planned with outside help.

Funerals are held throughout country after more than 290 people were killed on Easter Sunday.

The FBI joins the investigation, which experts say has the hallmarks of typical ISIS attacks.

Authorities believe the suspects are linked to a local terrorist group that could've had ties to a larger organization.

At least 40 people have been arrested in connection with the suicide strikes, as security footage shows a man, believed to be one of the bombers, approach St. Sebastian Church just before the attack.

Kieran was a "very self-driven" world-traveler who had visited multiple countries across five continents.

Members of an extremist Islamist group have been identified as suspects in a series of suicide bombings on churches and luxury hotels in Sri Lanka on Easter Day.

Police said at least seven suicide bombers were involved in the massacre. Now, a radical Muslim group is suspected in Sri Lanka bombings.

One of the Americans was identified Monday as Dieter Kowalski, 40, of Denver, according to his mother and Pearson, the London-based global education company that employed him.

Nearly 300 people were killed on Easter Sunday after coordinated bombings ripped through churches and luxury hotels in Sri Lanka.

Members of a radical Muslim group have been identified as suspects in a series of Easter suicide bombings on churches and luxury hotels across Sri Lanka.

Most of the eight explosions at hotels and Christian churches were detonated by suicide bombers, according to the Sri Lankan Defense Ministry.

Security presence has increased at landmarks like St. Patrick's Cathedral in Manhattan, where an attempted arsonist was arrested just last week.

The Eiffel Tower dimmed its lights Sunday night to honor victims of Sri Lanka bombings.

A series of explosions tore through churches filled with worshipers attending Easter mass. Three luxury hotels were also targeted.

Most of the explosions were detonated by suicide bombers, according to the Sri Lankan Defense Ministry.

Explosions at churches and hotels in Sri Lanka killed at least 207 and wounded hundreds more on Easter Sunday.

At least 450 people were also wounded in the string of attacks on Christian churches and hotels.

Nearly simultaneous explosions believed to have been carried out by suicide bombers on Easter Sunday.