(CNN) -- A recent suicide bombing at a police station mosque in Indonesia is an example of a new shift in terror attacks there and this new style of attackers could become very dangerous if the country does not address the trend, the International Crisis Group says.
Attackers are now coming from very small independent groups instead of the larger established terror groups in Indonesia like Jamaat Tawhid Anshoru or Jemaah Islamiyah , the crisis group says in a new report released Tuesday.
"The emergence of these small groups undertaking jihad on their own highlights the urgent need for prevention programs -- which are virtually non-existent in Indonesia," said Sidney Jones, a senior adviser with the group. "The critical task is to identify vulnerable communities, starting with areas that have produced extremist groups in the recent past, and think through possible programs that might strengthen community resistance to extremist teaching."
Friday's suicide attack in a mosque that is inside a police station in the city of Cirebon, killed the bomber and wounded dozens others, police said.
The attack is similar to a spate of letter bomb attacks in Jakarta in March and other attacks in the last few years, the crisis group said.
The signature shared by these attacks is the fact that they were committed by small groups that may have links to Indonesia's larger terror groups but seemed to work independently.
Another trend is the fact that these groups preferred "targeted killings over indiscriminate bombings, local over foreign targets," the group said.
One of the reason for the shift could be an effective government crackdown that has led to many recent arrests of members of Jamaat Tawhid Anshoru or Jemaah Islamiyah, the crisis group said.
"Prevention strategies that go beyond law enforcement are critical," the report said.