He said they adopted the type of "under the radar strategy" advocated by the group in which jihadi sympathizers who wouldn't be seen assuspect by U.S. authorities carry out attacks.
Reports said police identified Ziya T. as the main suspect in the case after DNA samples taken from his two brothers and a sister matched those found beneath Sierra's nails.
"Those stats aren't as shocking as they seem, they follow national trends and I suspect that there are more experiences with the assembly than the anonymous poll indicates, " said Ms Evans.