Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of the words: "Be Strong" and other floral and geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Typed bilingual Hebrew and English letter from a student at Hebrew Academy, a private Jewish day school in Montreal, Quebec. In English, the letter reads: "Dear Rabbi, I am very sorry for what happened in your shul. I hope everyone that got injured will heal quickly. I hope that it will never happen again. Sincerely, Max [last name redacted] From Hebrew Academy."

White envelope addressed to Tree of Life Congregation. Handwritten in black ink. Staining due to exposure to the elements at the Wilkins memorial.

Handwritten card from a student at Goddard Middle School in Littleton, Co. The front and back cover reads: "One of the happiest moments ever is when you find the courage to let go of what you can change." The inside reads: "Dear Tree of Life Congregation, I am so very, very sorry for your loss (losses). I know what it's like to lose someone. I am Camden. I am a student at Goddard Middle School. I am 13. I think that what happened with the shooting was not ok. Just because people have beliefs that are different it doesn't give people the right to do something that.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a butterfly with geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Hallmark card from a member of St. Peter's Episcopal Church in Londonderry, New Hampshire. The envelope contains the handwritten inscription: "God Bless" [heart]. The front cover reads: "Faith is the friend that comes along when things just seem to go all wrong." The inside reads: "My mother and I were so saddened when we heard of the tragedy that occurred. It seems unthinkable that a human being could behave in such a deplorable manner. My mother and I are keeping everyone and their families in our hearts, minds and prayers.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated Nov. 4, '18 and reads: "We are so sorry to learn of the horrible tragedy that has befallen your church. Please know that we at Point Loma Pres. in San Diego are with you in prayer always and that God will always make things right in His own time and way. Stay strong in His word and trust Him to heal your hearts. In this we pray and support you from afar. Eric [last name redacted] PLPC."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "My prayers are with you all during this unbelievable time of sadness for all of you in this congregation. I was so touched by the love... a beautiful outpouring of love, that you shared with one another during the vigils. The entire community is praying for all of you, and I hope that you are feeling surrounded by our love and prayers! Praying also for peace in our world! Kirsten, with love and blessings."

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated 11-4-2018 and reads: "Dear Friends, I wish I was there to put my arms around all of you but all I have is this paper and pen. May you sense comfort and care through these note and know that I and many more from the community in San Diego stand in solidarity with you and your community. We condemn such violence against God's children whom we all are on this earth and hope for a time of safety and peace throughout, soon!! God's peace, Sandy."

Miniature New York State flag. Wrapped around stem of flag is a slip of laminated yellow paper reading, "In Memory of our Brother MELVIN WAX z''l -- To his family and community we pray Tanuchamo min hashamayim. May God in Heaven comfort you. The Principals, Teachers, Parents, Alumni, and Students of Magen David Yeshivah. Brooklyn, NY." Part of a series of 11 flags, each dedicated to one of the victims. Additional photograph shows the entire set of 11.

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a butterfly with geometric motifs. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Folded card on red paper with blue and pink stains. Due to exposure to the elements at the Wilkins memorial, the message on this card is no longer visible.

Post-it note with handwritten message in green marker. The message reads: "Never again." The signature is illegible.

Printed tag with a photograph of Melvin Wax. The tag reads: "In Memory of Melvin Wax." Creasing and staining due to exposure to the elements at the Wilkins memorial.

Post-it note with handwritten message in black marker. The message reads: "We love you!" An illustrated heart appears in the upper right corner.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter is dated 11/4/18 and reads: "To the families and friends of Tree of Life Synagogue: Please be comforted by the prayers for your losses- offered up by believers of many faiths. Only God can know why this tragedy occurred, but know that He will hold you in his loving arms to heal you with his abiding love and faithfulness. The prayer quilt is tired with countless prayers as well. Be comforted when you see it.

Post-it note with handwritten message in red marker. The message reads: "We will love you forever." Creasing due to exposure to the elements at the Wilkins memorial.

Floral tag from floral arrangement sent by the Vishny family in Irvine, California. The bouquet was sent in memory of Rose Mallinger, and all the other October 27 attack victims. The note is printed on a tag with a beige background from a local florist.

Four-page program with readings and song lyrics. Cover features photograph of a grid of memorial candles and lists names of 14 officiants.

Summary: KDKA-TV report providing a history of mass shootings in the Pittsburgh area between 2000 and 2018.