Definition: You will be given three sentences. Read them, then identify a noun phrase (person, place, or thing) or event that is shared between all three sentences. As the output, write the span of the text corresponding to that phrase in each sentence. Keep the order of the sentences, that is, your answer should look like: 1: *a phras from sentence 1e* 2: *a phras from sentence 2* 3: *a phrase from sentence 3*
Input: 1: Fifty officers were killed by firearms -- 15 in ambush attacks -- in 2014 , the Memorial Fund said . 2: That 's compared with five ambushes among 32 shooting deaths in 2013 and six ambush deaths during 2012 , according to the FBI . 3: Firearms killed 50 officers in 2014 , up from 32 in 2013 , the Officers Memorial Fund says .

1: ambush attacks 2: shooting 3: killed