Police have beefed up security outside the Taj hotel in south Mumbai after the Karachi Stock Exchange terror attack, a senior official said on Tuesday. The iconic hotel in Colaba area was among the targets of Pakistani terrorists during the 26/11 Mumbai terror attack. The official told PTI that Mumbai police are on high alert after Monday's Karachi exchange terror attack and as part of the enhanced anti-terror measures, security outside the hotel and other vital installations has been increased.