2245907 I hear sirens. CK 1 54161 The siren blew. CK 1 2549003 Tom heard a siren. CK 1 2275390 Don't you hear those sirens? CK 1 1867842 Tom took off running when he heard the sirens. CK 1 2620693 The sirens went off. Joseph 1484768 The sirens are wailing. Spamster 271621 The noon siren is blowing. CM 3130459 I could hear sirens in the distance. CK 2956959 Tom heard sirens approaching and ran off. CK 3223180 Tom was about to sit down when the siren sounded. CK