After threats of an explosive in the area, the Chicago police ordered an estimated 40,000-strong crowd at the Wrigley Field to vacate the area on Sunday but found no trace of any bomb.

The bomb threat was reportedly received after the Chicago Cubs game in the arena, the Chicago Tribune said.

The same report added that the bomb threat was channeled through the Town Hall police district with authorities failing to reveal more details of the incident.

"Following our game this afternoon, we received a bomb threat and took swift action to clear the few remaining fans, players, staff and media from the ballpark. After a thorough search by law enforcement, no evidence was found to suggest this threat was credible," read a Cubs statement.

The investigation reportedly finished at around 7 p.m. with members of the media allowed back into the stadium around the said time.

Sports Illustrated added the police were aided by bomb sniffing dogs which found no explosive material inside the stadium after fans, members of the media, players and crew workers were evacuated.

Prior to the bomb threat, the Cubs grabbed a 2-0 victory against the San Francisco Giants.

According to Sports Illustrated, pitcher Jake Arrieta made things great for his team "allowing four hits in 7 2/3 shutout innings, stifling the San Francisco Giants in a 2-0 victory."

It added that the Cubs has made its lead margin greater to 3.5 games versus the Giants as they vie for the second NL wild card spot.

In an ESPN report, Arrieta said that his team does not intend to slow down in the remaining games.

"Because of the division we're in, the two teams ahead of us, we know they're not slowing down and we don't intend to either," Arrieta said.

"What we have to do now is just continue to make it difficult for the guys ahead of us and continue to show we're going to put pressure on and not let up."

Arrieta said that he planned and practiced to dominate the game against the Giants today.

"Win the first three with a chance to sweep, I was in the mindset of coming out to dominate today and put us in the situation where we only needed one or two (runs)," the pitcher aded.

For his part, Cubs manager Joe Maddon said that the plan of the team is just to play well.

"We've hit the ball better overall in the series, we're catching the ball and the starters have done a really nice job for the most part. The bullpen, we still have to get that on firm ground," Maddon said.