The LA County Sheriff's have put out a press release on the seizure of fireworks Monday morning:

Altadena Sheriff's Station deputies responded to the intersection of Fair Oaks Avenue and Mariposa Street, Altadena, regarding a "Fireworks / Juvenile Disturbance" call. They saw the suspects place three long objects, which were tied together, in one of the turn lanes and attempt to light them. The deputies arrived before the objects were ignited and any vehicles drove over them. The area was blocked-off and the suspects were detained.

An Arson/Explosives Detail investigator responded to the intersection and determined the objects were pyrotechnic mortar rounds. These objects are highly dangerous fireworks considered to be explosives and can cause harm when used inappropriately.

Further investigation led detectives to locate additional pyrotechnic mortar rounds at the residence of one of the suspects. Approximately 50 explosives were seized, rendered safe and transported out of the area.

Still no word as to if these are tied to the explosions reported in the neighborhood the midnight before.  Reader "P" sent us a working link to the KTLA report.