A bomb exploded Sunday in a Mediterranean resort hotel in southeast Spain after a telephone warning from the Basque separatist group ETA, Interior Ministry officials said. The ministry office in the southeast The hotel bombing occurred two days before Spain's Parliament was scheduled to debate — and almost certainly reject — a proposal making the Basque region virtually independent. On Jan. 18, a powerful car bomb exploded in the affluent town of Gexto near the main Basque city, Bilbao. That blast also was preceded by a call from a person claiming to speak for ETA.