The Welsh made it 3-0 in the 19th minute, to cement Arsenal's comfortable lead after Koscielny's header five minutes earlier.
Mkhitaryan won the Bundesliga Players' Player of the Season in his final year at the Westfalenstadion while Aubameyang picked up the Bundesliga's top scorer with 31 goals last season.
The horrendous nearly got worse three minutes after that but Nacho Monreal's header came back off the post and his follow-up shot a few seconds later after Mkhitarian had crossed from the right once more hit Keane and bounced wide.
The north London club were at it from the beginning, with the first goal coming after only six minutes. Walcott swung in an excellent ball from the right at which the striker flung himself but his prodded effort hit the post.
Arsenal's new-look forward line slotted effortlessly into gear as the two one-time Dortmund allies combined to create a sixth-minute opener. In the build-up to the game, the Everton boss said he was looking for more consistency from his team following the midweek win against Leicester City but the only consistent pattern he got from his side was the Blues' inability to trouble teams away from home.
He said: "When you see the players we have up front and the players on the bench who can come on, you're thinking of the creativity and the electricity they bring into the team".
As well as fixes for matchmaking and SOS flares, issues with the Hunting Horn have also been sorted, among other things. To celebrate 5 million sales, Capcom is awarding all Monster Hunter World players a free Celebration Pack.
Clouds will be building from midday on, while the southwest winds take temps back to normal and even slightly above normal levels. Bank Stadium which is a covered dome, but during pregame time fans outside will have to deal with single digit temperatures .
The worker, a man in his 50s, spoke to reporters on the condition that he not be identified because he has received threats. Officials said the man refused to cooperate with state or federal investigations beyond providing a written statement.
EA's stock price went up on Monday after the Polygon news site reported that EA may be the target of a Microsoft acquisition. But a year ago, EA released Battlefield 1 and Titanfall 2, making for a tough comparison to year-ago figures.
But if the groundhog doesn't see its shadow due to cloudy weather, it's believed that spring will arrive early that year. Last year, she called it correctly - an early spring - but we don't have a complete record of her earlier predictions .
TASS reported that "according to preliminary information, the plane was shot down from a portable anti-aircraft missile system". Syrian government troops launched a major offensive around Idlib in late December, backed by Russian jets.
Thurman, someone he considers a colleague and a friend, waited 25 years to make these allegations public, noting that he and Ms. Not long afterward, Weinstein attempted to force himself on her again at the Savoy Hotel in London, Thurman said.
A student who was in the class when shots rang out said he thought the gunfire was an accident, CNN affiliate KABC reported. LAPD Detective Meghan Aguilar said a suspect - a female student - is in custody, adding that a weapon has been recovered.
The filing cabinets in question were sold off especially cheaply, because they were clearly full, and no-one could find the keys. The government has ordered a review into how the cabinets were disposed with the files in them.
A listing of latest Amtrak derailments, crashes
The Silver Star was en route from NY to Miami with almost 150 people aboard when it struck the empty CSX train around 2:45 a.m. According to a statement from the governor, 116 people involved in the crash were transported to local hospitals.
More civilian causalities due to Turkish operation in Afrin
Authorities initially said they believed the blast was a gas explosion but did not rule out the possibility of "sabotage". Ercan Topaca said three people had sustained light injuries from flying debris at the scene of Thursday's explosion.
Famous Groundhog, Punxsutawney Phil Prediction Revealed for 2018
On Gobbler's Knob in Punxsutawney, Phil's "Inner Circle" - garbed in top hats and tuxedos - announced his prediction at 7:25 a.m. The event now attracts up to 30,000 visitors to Punxsutawney, Jefferson County, located about 80 miles northeast of Pittsburgh.
USA restricts arms transfers to bloodied South Sudan
Companies and entities seeking a license to export defense materials to South Sudan will be denied under the new restrictions. South Sudan is the worlds youngest country, and has been supported by the USA since it's inception in 2011.
Polar bears are starving as Arctic ice melts, warns U.S. study
And they should lobby the global community more to address greenhouse gas emissions, which threaten the polar bears' habitat. While four bears put on weight, five bears lost up to 10 per cent of their body weight - between 18 and 20 kg - in 10 days.