NEW ORLEANS >> Riley Leonard passed for a touchdown, Jayden Harrison returned a kickoff 98 yards for a score, and Notre Dame’s defense made it hold up in a 23-10 victory over No. 2 Georgia in the Sugar Bowl on Thursday that sent the seventh-seeded Fighting Irish into the semifinals of the College Football Playoff.

In a game that was delayed by a day because of a deadly terror attack in the host city, Notre Dame (13-1, No. 3 in AP poll) made enough big plays and got some help from a clever move by coach Marcus Freeman.

“Our coaches called the game aggressive. Our players executed, put everything on the line for this university and this football team,” Freeman said. “I’m really proud of them. Proud of the way they handled the events of the last 24 hours.”

Georgia (11-2) was in position to close within one score when Notre Dame stopped it on fourth-and-5 from the Irish 9-yard line with 9:29 to go.

Minutes later, Notre Dame had a fourth-and-short deep in his own territory when Freeman sent the punt team out before running all 11 players off the field and sending the offense out. Georgia raced to match up and then jumped offside as the play clock ticked down, giving the Irish a clock-sapping first down with 7:17 to go.

“They were going to hard-count us. We prepare for that. We do it every week,” Georgia coach Kirby Smart said. “We jumped offsides.”

By the time the Bulldogs got the ball back, just 1:49 remained, and Notre Dame was well on its way to its 12th straight victory and a date with Penn State (13-2, CFP No. 6 seed) in a semifinal at the Orange Bowl in Miami on Jan. 9.

“That’s the aggressiveness in terms of our preparation that I want our program to have,” Freeman said. “That’s got to be one of our edges, that we are going to be an aggressive group and not fear making mistakes.”

Georgia entered the game without starting quarterback Carson Beck, who injured his elbow in the Southeastern Conference championship game. He was replaced by Gunner Stockton, who was 20 of 32 for 234 yards and one touchdown.

The Bulldogs outgained Notre Dame 296 yards to 244, but Georgia was stopped on all three of its fourth-down attempts and lost two fumbles — one deep in Notre Dame territory and one inside its own 20.

“The turnovers are the difference in the game, guys,” Smart said. “I mean, you should know when you turn it over twice and they return a kickoff for a touchdown, you’re not going to have a lot of success.”

Leonard finished with 90 yards passing and a team-high 80 yards rushing, including a late first-down run in which he was sent head over heels as he tried to leap over a defender.

“We’re in the playoffs,” Leonard said. “Everybody else can put their body on the line, I’m going to do it right there with them.”

Georgia and Notre Dame fans packed a plaza adjacent to the Superdome and enjoyed music under clear skies — under the watch of snipers on rooftops — before filtering into the stadium.

The game had been set for Wednesday night as part of a New Year’s Day playoff tripleheader, but it was postponed after an Army veteran inspired by the Islamic State group drove a pickup truck into a crowd on Bourbon Street early Wednesday morning, killing 14 and injuring dozens more. Security was increased at the Superdome — which will also host the Super Bowl next month — and arriving fans said they felt safe.

Flags were at half-staff outside nearby government buildings in memory of those killed in the attack, which has been labeled by authorities an act of terrorism.

The attack occurred on Bourbon Street, which runs through the heart of the French Quarter and is famously lined with bars, restaurants and clubs, near the corner of Canal Street, a main downtown artery.

The crime scene, which was gradually being cleared so it could be reopened to the public, is about a mile’s walk from the Superdome.

Security was ramped up in and around the stadium.

Police blocked regular traffic from passing by the main Superdome entrance on Poydras Street, an eight-lane downtown artery.

A helicopter circled overhead.

Security officers around the 70,000-seat stadium were handling dogs trained to sniff for explosive devices. They encircled cars entering the dome’s parking garage and in some cases sniffed bags and backpacks.

With some fans unable to alter their travel plans, attendance in the 70,000-seat stadium was announced at 68,400. There were some patches of empty seats in the upper levels, but passionate supporters made no shortage of noise trying to will their teams into the next round of college football’s first 12-team playoff.

“It was a lot of fun. It felt safe,” said Shannon Horsey, a Georgia fan in her 40s who lives in Austin, Texas. “Coming in they searched my bag thoroughly. So I felt like, OK, they’re really paying attention.”

Horsey was in New Orleans with her husband, Joe, a 48-year-old Georgia graduate, and their teenage children, Jack and Zoe.

They extended their stay after the game, originally scheduled for Wednesday night, was postponed because of the attack.

Amid the enhanced security, the game concluded without incident.

“We can see the presence up on the rooftop,” Horsey said, pointing at a sniper above Champions Square. “So, I kind of felt like this is probably one of the safest places to be in the city.”

Joe Horsey said the pregame crowd was larger than he expected but he also found the “energy lower than a normal football game.”

The game was tied at 3-all before Notre Dame scored 17 points in a span of 54 seconds.

The unusual sequence began with Mitch Jeter’s 48-yard field goal with 39 seconds left in first half.

Soon after, Georgia paid for a decision to attempt a drop-back pass from its own 25. RJ Oben’s blind-side sack caused Stockton to fumble at the 13, where Irish defensive lineman Junior Tuihalamaka recovered. Leonard found Beaux Collins over the middle for a touchdown on the next play for a 13-3 lead that stood at halftime.

By the time 15 seconds had elapsed in the third quarter, Notre Dame led 20-3.

Harrison took Georgia’s second-half kickoff all the way to the end zone, slipping a tackle near the middle of the field, cutting toward the right sideline and outrunning everyone.

Georgia closed the gap to 20-10 when Stockton hit reserve running back Cash Jones for a 32-yard score before Jeter’s third field goal of the game gave the Irish their winning margin.