law enforcement investigators say they have seized two electronic devices and one of arkan's victims recounted the attack. >> it all happened so fast. the time frame is compressed. 15 to 30 seconds i heard the shots, and it was over. >> reporter: investigators tell fox25 that artan was not on their radar prior to the through pakistan arriving in 2014. he was a legal, permanent resident. he excelled in school, graduated from columbus state community college with an associate degrees and cum laude honors. he created of warped of sleeper cells. he praised a cleric killed in a u.s. drone strike that has evolved as a symbol of online jihad the department of homeland security warned of a specific threat. concerned that terrorist individuals and home-grown violent extremists may be encouraged or inspired to target public events or places. recent jihadist online propaganda promoted attacks and.recommended using car or knives. >> plenty of evidence that this individual may have been motivated by extremism and carrying out a seen of terrorism. >> praised is officer alan horujko. there was an a