How can I run destroy_all on an array?

I've got the follow query:

spam_users = User.find_by_sql("SELECT * FROM users WHERE email ~* '21cn.com'")

I've tried running spam_users.destroy_all but I get undefined method 'destroy_all' for #<Array:0x10b09ce30>.

I'm running Rails 2.3.8 in this particular app along with PostgreSQL.

ruby-on-rails postgresql activerecord rails-activerecord
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