Post-it note with handwritten message in black marker. The message reads: "Rest in Peace. Toronto."

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside contains message of condolence and a wish for peace, articulated through citations to the Book of Psalms. The church's contact information is included on the back of the envelope.

Post-it note with handwritten message in black marker. The message reads: "The neighborhood is with you." A heart appears below.

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

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

Black and white photograph showing the original section of the Tree of Life synagogue located at the corner of Wilkins Avenue and Shady Avenue in Squirrel Hill.

Floral tag from floral arrangement addressed to Tree of Life synagogue. The message is printed on a tag from a local florist.

Handwritten tag in silver ink on heavy cardstock lined on an orange backing. A small snail, labeled: "Certified and Official Snail Mail" is embossed on the upper center. The note reads: "With Love, Mark [last name redacted] Beaver Dam, WI." Dirt stains due to exposure to elements at the Wilkins memorial.

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

Square card with white and yellow text against blue background. Card reads, "Mitzvah4Pittsburgh. Some spread darkness. We spread light. Choose a good deed. Choose a Mitzvah. Add light to the world," followed by four options and a place for respondents to list their name and email address. Some names and email addresses have been redacted for privacy.

Bright pink paperboard with messages written in black on the front. Blank back.

Handwritten note in red marker on a piece of brown paper from a family. Dated 10-27-18.

White posterboard with an illustration of the Pittsburgh skyline and various handwritten messages. The names and ages of the eleven victims of the October 27 attack appear on the left, followed by the acronym "RIP" (Rest in Peace). The inscription, "You can't break a city made of steel," appears in the upper center. The words, "Pittsburgh is are (our) city," appears below with an arrow pointing to an illustration of one of Pittsburgh's iconic yellow bridges; "Never forget 10-27-18" appears underneath.

Black poster with several items affixed to it, including a black and red heart in the upper right corner and various pieces of paper with printed and handwritten inscriptions. Blank back.

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

Post-it note with handwritten message in blue marker. The message reads: "Recover well." Signed with a Star of David.

White envelope with blue border and curlicue designs in the four corners. Handwritten note in black ink on the recto reads: "Tree of Life Congregation." Staining and color fading due to exposure to the elements at the Wilkins memorial. The reverse side features a diamond pattern and has suffered from extensive tearing due to exposure to the elements at the Wilkins memorial.

Page of typed text, printed front and back. Includes a silhouette graphic of people standing under a tree. Lists participants in event. Footer includes logos for Squirrel Hill Stands Against Gun Violence and Ceasefire PA.

Handwritten card from a student at Goddard Middle School in Littleton, Co. Front cover contains the following quote: "Never regret a day in your life. Good days give you happiness and bad days give you experience." Shows three small Stars of David on the far left and a cartoonish illustration of a stick figure pushing a pull with a Star of David on top of a heart up a hill on the center right. Inside reads: "Dear Tree of Life Congregation, My name is Yahir [last named redacted] and we heard what happened and we want you to [k]now that we pray for you.

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