From Longman Dictionary of Contemporary Englishafirea‧fire /əˈfaɪə $ əˈfaɪr/ adjective, adverb [not before noun] literary BURNburning SYN ablaze One of the boats had been set afire.
Examples from the Corpus
afire• The oil tanker was afire.set afire• At least one had been set afire.• Hundreds of small wooden fishing boats are set afire and dozens are torn to pieces by the blast.• Longtime residents recall seeing police cars overturned and set afire because the officers had dared tried to patrol here.• In Lushnje, the town hall was set afire with Molotov cocktails. 