Yadgarov admitted his involvement, and was remanded to police custody. An indictment is expected to be filed against him on Thursday.
The covert investigation began after Jerusalem police detectives received a tip about Yadgarov's involvement in assembling explosive devices.
After following him for a few weeks detectives discovered he was building a sophisticated demolition charge in his home, activated by remote control and containing large amounts of shrapnel, nails and metal parts.
On May 4, around 2:00 am the investigations spotted Yadgarov as he was driving his car in Jerusalem and arrested him.
A medium-sized demolition charge intended to target criminals and a bag with bomb making components were found when investigators searched his home. Yadgarov later confessed to making the explosive device.
Investigators examined other devices they had discovered across the country to check whether they matched the components used by Yadgarov. They found three matching bombs in Jerusalem and in Lod.
Yadgarov was released from jail only a year ago, after serving five years behind bars for a similar offense, according to police.
- Follow Ynetnews on Facebook