Tight security in Chicago for Cubs, Bears and Columbus Day Parade

CHICAGO -- Monday is a big day for security officials in Chicago, because the city has three popular events on its schedule.

The Cubs hosted the Washington Nationals in Game 3 of the National League divisional playoffs.

A pair of home wins Monday and Tuesday would send the Cubs to the NL championship series. Monday's game started at 3:08 p.m. and Tuesday's starts at 4:30 p.m.

For both games, Mike Ditka will give the ceremonial command, “Play Ball!" Bill Murray will sing the 7th Inning Stretch.

To ensure adequate security for Cubs fans, metal detectors were in place at Wrigley Field. Metal garbage cans were removed from Wrigleyville street corners; mailboxes were temporarily removed; and streets near the ballpark -- especially Sheffield and Waveland -- were closed, starting three hours before the game.

All around Wrigley Field, Chicago police officers were on the street, on their bikes and armed with AR-15s.

“I’m a season ticket holder. Here all the time. I see the security and I think I’m feeling very comfortable,” Robert Wedgeworth, Cubs fan, said.

For many at the game, and at other big events, they couldn’t help but think about the possibility of an attack.

“Just pray and hope nothing ever happens. It’s always in the back of your head you know,” Anais Perez, a Cubs fan, said.

There was also a Vapor Wake Dog on hand who can smell explosives from 100 yards away; another way officials are keeping people safe.

Also on Monday's schedule was the Columbus Day Parade, which stepped off from State and Wacker at 12:30 p.m.

Later Monday night, the Bears welcome the Vikings to town for Monday Night Football. Kickoff is at 7:30 p.m.

WATCH: CHICAGO FANS PUMPED FOR CUBS, BEARS GAMES

It was a big day for sports fans as both Cubs and the Bears were playing on Monday.

Grills were fired up and fans were riled up for both of the Chicago teams' games.