diff --git a/src/client/HostLobbyModal.ts b/src/client/HostLobbyModal.ts
index c086354e6..6bca2ca8c 100644
--- a/src/client/HostLobbyModal.ts
+++ b/src/client/HostLobbyModal.ts
@@ -655,6 +655,7 @@ export class HostLobbyModal extends BaseModal {
             detail: {
               gameID: this.lobbyId,
               clientID: this.lobbyCreatorClientID,
+              source: "host",
             } as JoinLobbyEvent,
             bubbles: true,
             composed: true,
diff --git a/src/client/JoinLobbyModal.ts b/src/client/JoinLobbyModal.ts
index 7cd330d64..0f1c5e2da 100644
--- a/src/client/JoinLobbyModal.ts
+++ b/src/client/JoinLobbyModal.ts
@@ -336,6 +336,7 @@ export class JoinLobbyModal extends BaseModal {
         detail: {
           gameID: lobbyId,
           clientID: this.currentClientID,
+          source: "public",
         } as JoinLobbyEvent,
         bubbles: true,
         composed: true,
@@ -776,6 +777,7 @@ export class JoinLobbyModal extends BaseModal {
           detail: {
             gameID: lobbyId,
             clientID: this.currentClientID,
+            source: "private",
           } as JoinLobbyEvent,
           bubbles: true,
           composed: true,
@@ -834,6 +836,7 @@ export class JoinLobbyModal extends BaseModal {
           gameID: lobbyId,
           gameRecord: parsed.data,
           clientID: this.currentClientID,
+          source: "private",
         } as JoinLobbyEvent,
         bubbles: true,
         composed: true,
diff --git a/src/client/Matchmaking.ts b/src/client/Matchmaking.ts
index 4e53ea6ab..3fa4af738 100644
--- a/src/client/Matchmaking.ts
+++ b/src/client/Matchmaking.ts
@@ -231,6 +231,7 @@ export class MatchmakingModal extends BaseModal {
         detail: {
           gameID: this.gameID,
           clientID: getClientIDForGame(this.gameID),
+          source: "matchmaking",
         } as JoinLobbyEvent,
         bubbles: true,
         composed: true,
diff --git a/src/client/SinglePlayerModal.ts b/src/client/SinglePlayerModal.ts
index 7a10f21aa..1623d996e 100644
--- a/src/client/SinglePlayerModal.ts
+++ b/src/client/SinglePlayerModal.ts
@@ -967,6 +967,7 @@ export class SinglePlayerModal extends BaseModal {
             },
             lobbyCreatedAt: Date.now(), // ms; server should be authoritative in MP
           },
+          source: "singleplayer",
         } satisfies JoinLobbyEvent,
         bubbles: true,
         composed: true,
diff --git a/src/core/execution/BotExecution.ts b/src/core/execution/BotExecution.ts
index 4f9f178f9..85fabb34a 100644
--- a/src/core/execution/BotExecution.ts
+++ b/src/core/execution/BotExecution.ts
@@ -1,7 +1,8 @@
-import { Execution, Game, Player } from "../game/Game";
+import { Execution, Game, isStructureType, Player } from "../game/Game";
 import { PseudoRandom } from "../PseudoRandom";
 import { simpleHash } from "../Util";
 import { AllianceExtensionExecution } from "./alliance/AllianceExtensionExecution";
+import { DeleteUnitExecution } from "./DeleteUnitExecution";
 import { AiAttackBehavior } from "./utils/AiAttackBehavior";
 
 export class BotExecution implements Execution {
@@ -58,6 +59,7 @@ export class BotExecution implements Execution {
     }
 
     this.acceptAllAllianceRequests();
+    this.deleteAllStructures();
     this.maybeAttack();
   }
 
@@ -80,6 +82,14 @@ export class BotExecution implements Execution {
     }
   }
 
+  private deleteAllStructures() {
+    for (const unit of this.bot.units()) {
+      if (isStructureType(unit.type()) && this.bot.canDeleteUnit()) {
+        this.mg.addExecution(new DeleteUnitExecution(this.bot, unit.id()));
+      }
+    }
+  }
+
   private maybeAttack() {
     if (this.attackBehavior === null) {
       throw new Error("not initialized");
diff --git a/src/core/game/PlayerImpl.ts b/src/core/game/PlayerImpl.ts
index fae23df8e..64cdf70c8 100644
--- a/src/core/game/PlayerImpl.ts
+++ b/src/core/game/PlayerImpl.ts
@@ -20,6 +20,7 @@ import {
   ColoredTeams,
   Embargo,
   EmojiMessage,
+  GameMode,
   Gold,
   MessageType,
   MutableAlliance,
@@ -29,6 +30,7 @@ import {
   PlayerProfile,
   PlayerType,
   Relation,
+  StructureTypes,
   Team,
   TerraNullius,
   Tick,
@@ -994,10 +996,10 @@ export class PlayerImpl implements Player {
         if (!this.mg.hasOwner(targetTile)) {
           return false;
         }
-        return this.nukeSpawn(targetTile);
+        return this.nukeSpawn(targetTile, unitType);
       case UnitType.AtomBomb:
       case UnitType.HydrogenBomb:
-        return this.nukeSpawn(targetTile);
+        return this.nukeSpawn(targetTile, unitType);
       case UnitType.MIRVWarhead:
         return targetTile;
       case UnitType.Port:
@@ -1024,7 +1026,7 @@ export class PlayerImpl implements Player {
     }
   }
 
-  nukeSpawn(tile: TileRef): TileRef | false {
+  nukeSpawn(tile: TileRef, nukeType: UnitType): TileRef | false {
     if (this.mg.isSpawnImmunityActive()) {
       return false;
     }
@@ -1034,6 +1036,24 @@ export class PlayerImpl implements Player {
         return false;
       }
     }
+
+    // Prevent launching nukes that would hit teammate structures (only in team games)
+    if (
+      this.mg.config().gameConfig().gameMode === GameMode.Team &&
+      nukeType !== UnitType.MIRV
+    ) {
+      const magnitude = this.mg.config().nukeMagnitudes(nukeType);
+      const wouldHitTeammate = this.mg.anyUnitNearby(
+        tile,
+        magnitude.outer,
+        StructureTypes,
+        (unit) => unit.owner().isPlayer() && this.isOnSameTeam(unit.owner()),
+      );
+      if (wouldHitTeammate) {
+        return false;
+      }
+    }
+
     // only get missilesilos that are not on cooldown and not under construction
     const spawns = this.units(UnitType.MissileSilo)
       .filter((silo) => {