It may have been an accident, though:
Mr Jamal had only recently moved into the property.
Palestinian officials have been quoted as saying the blast took place when Mr Jamal attempted to move a safe from an old embassy building to the new one.
"The device was in a safe and was triggered after the door of the safe was opened. The police are not ruling out that the device was a part of the safe," Czech police spokeswoman Andrea Zoulova told Reuters.