Do-It-Yourself

In Manhattan, four F.W. Woolworth stores and a supermarket were fire-bombed one night last week with reasonably sophisticated incendiary devices ignited by acid. Two days later in Washington, bombs went off at four Latin American embassies.

Such incidents, sometimes involving expertly built homemade fireworks, have prompted a measure of dubious ingenuity on the part of authorities as well. Several librarians attending a meeting of the American Library Association in Detroit complained that Treasury agents have been trying to snoop through their lending records to see who has checked out books on explosives. In March, a Detroit public-library book turned up in a Chicago apartment where police found a cache of explosives. The police set out to discover who had checked it out, but they could not. The book had been stolen from the library.

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