A series of small explosive devices detonated early yesterday outside the Chevy Chase home of television and radio broadcaster Paul Anthony. Police charged five juveniles in connection with the blasts.

The devices -- one of them set off when a police car crossed a trip wire in Anthony's driveway -- caused no apparent damage, fire officials said.

Anthony said the early morning explosions were the latest in a "siege of harassment" over recent months, apparently aimed at his 16-year-old son.

"It was something more sophisticated that the cherry bomb over the fence," Anthony said. "This has been an ongoing siege of harassment with me and my family for the last nine months. There have been fireworks in the middle of the night. Sometimes a big display, sometimes a little display. This was the most sophisticated thing so far."

He said he did not know why his son, a student St. Anselm's Abbey School in Northeast Washington, might have become a target of the apparent pranks. "It's a school-related thing," he said. "I don't know what precipitated it."

One of the youths arrested, a 16-year-old who lives near the Anthonys, was charged as a juvenile with destruction of property and possession of explosives, fire officials said. The other four juveniles were charged with possession of explosives.

Anthony is well known to Washington area television viewers as the occasional weather reporter for WDVM-TV (Channel 9). He also hosts a weekend jazz show for WGMS radio.

The explosions woke Anthony and his family from their sleep around 3:30 a.m.

According to fire investigators, the explosives were composed of undisclosed but easily obtainable chemicals that were packed into glass jars.

Two of the explosives were detonated before police arrived, investigators said. A third was triggered when by a police car arriving at the scene, they said.

Investigators said they found two additional devices nearby that had not been detonated