I was there during the IRA attack on my hometown of Manchester – and I know what made it a target for Isis

Terrorism has carved out the modern city of Manchester. Twenty-one years ago, an IRA truck packed with 1,500kg of fertiliser turned a sizeable area of the city centre into a smoking wreck.

It was 15 June 1996, my first day at work as a shop assistant in the grand old Kendals department store, just down the road from the bomb. We were gathered in a scruffy upstairs meeting room for a routine briefing by the head of security when it went off.

We could hear the blast before it impacted, barrelling down Deansgate like an invisible tsunami. When we emerged (thankfully unscathed) onto the street for evacuation, the first thing we saw was that the shop’s ground-floor display windows had all been shattered and the fashion mannequins were lying half in and half out.

Monday night’s atrocity in the Manchester Arena is simultaneously less destructive and more so. Unlike in the IRA’s outrage, which caused upwards of £700m of damage, the direct destruction of physical property this time seems likely to be minimal.

But the human cost this time is on a different scale of grief. There were some 220 injuries from the 1996 blast, some of them serious, but no fatalities, mainly because the IRA gave an hour’s warning. Suicide bombers, however, don’t give warnings. At the time of writing, 22 people are already dead and 59 injured. And the horror of the target this time – young people attending a pop concert – makes this feel like it belongs in a different category: a separate species of depravity.

Manchester’s modern economic renaissance arguably began with the 1996 bombing. The city responded to the devastation with an imaginative programme of urban regeneration. It has delivered new transport infrastructure, buildings, renovations, clean-ups and the fashioning of some wonderful public places. An extensive overhaul of the previously unlovely Victoria station, adjoined to the very Manchester Arena complex where Monday’s mass murder took place, was completed only two years ago.

Public investment has helped to uncork the animal spirits of the private sector. Thousands of new firms have come. International firms, from Adidas to Kellogg’s to Gazprom, have located their UK headquarters in the city. Chinese investment is flowing in. The BBC has a major presence in neighbouring Salford, with possibly more media companies to follow. My old employer Kendals must now contest the luxury retail market with southern titans such a Selfridges and Harvey Nichols.

Manchester shows that “post-industrial” can be a springboard, rather than a curse. Its industrial heritage is still all around in the shape of magnificent classical warehouses, built by Victorian cotton barons. But Manchester isn’t stuck in the past. It’s a services-based economy now: outward-looking and confident. The warehouses have been converted into flats. In the decade to 2011, the city centre’s population grew by almost a fifth, the biggest expansion of any UK city outside London. Manchester has cemented its position as the second most economically vibrant city in the UK. Northern Powerhouse indeed.

How will community relations in multicultural Manchester be affected by this atrocity now that Isis has claimed responsibility for the attack? How will Manchester’s services economy cope? What will befall its thronging retail and entertainment sectors? What will happen to investment? One suspects the city will manage in the same impressively resilient way that London has coped since the 7/7 suicide bombings on the capital’s transport system in 2005.

There’s no going back on the Mancunian diversity front. Manchester’s two huge universities mean that the city is stuffed with proud citizens of the world of all ethnicities and religions who come to study. And the students often stay after graduation. Manchester has long been a tolerant place – and that is most unlikely to change. Businesses will push on too. This economic snowball has too much momentum to be stopped by a maniac with a rucksack full of explosives and a head full of medieval bigotry.

Manchester’s capacity, its symbolism, its openness, its sheer importance, all made my home city a target for the merchants of hatred and violence back in 1996 and, it seems, in 2017. That openness, of course, is the city’s vulnerability. But, as with all great cities, its vulnerability is also the source of its strength. And that strength will, once again, show itself.