MADRID -- A terrorist bomb exploded in a crowded British Airways ticket office Monday, killing one woman, in a attack claimed by a group that said it was responding to President Reagan's vow to 'fight back' against terrorists.
Authorities said 27 other people, including a vacationing American teenager, were injured in the midday bombing on Gran Via, Madrid's best-known shopping boulevard.
In a second attack minutes later, gunmen shot out the windows of a nearby Jordanian airlines office and hurled a grenade inside. Police defused the grenade and there were no injuries. No one immediately claimed responsibility for that assault.
The attacks came one day after 39 American hostages, seized by Shiite Moslem extremists who hijacked a TWA jet, were freed in Beirut after 17 days in captivity.
An Arabic-speaking caller telephoned an international news agency in the Lebanese capital Monday to claim responsibility for the bombing at the British Airways office, which is located in the same building as a TWA office.
'The bombing of the TWA office came as a direct reply to Ronald Reagan's threat that he would strike at terrorists,' he said. 'Let Reagan know that our hands will reach the whole world and we shall never remain silent after this.'
The caller said he represented the 'Organization of the Oppressed.' The TWA hijackers gave reporters a statement signed by 'The Oppressed of the Earth.' And during the hostage crisis, two of the hijackers identified themselves as members of a previously unknown group called 'The Oppressed on Earth.'
In a speech after the release of the hostages on Sunday, Reagan warned terrorists that 'we will fight back against you in Lebanon and elsewhere. We will fight back against your cowardly attacks on American citizens and property.'
Police at the scene of the two Madrid attacks said two people were arrested on Gran Via. However, spokesmeN at police headquarters said no one was in custody, although suspects might have been detained for identification.
Spanish authorities quickly linked the attacks to the Beirut hostage crisis.
'The suspicions are quite clear and (the attacks) are probably related to the TWA hijacking,' Joaquin Leguina, president of the Madrid regional government, told reporters.
'From the site chosen, on a summer morning on Madrid's Gran Via, it is clear that suspicions center on an Arab group,' he said.
A Spanish court June 25 sentenced two Lebanese Shiites to prison terms of 23 years for the attempted assassination of a Libyan diplomat. The TWA hijackers had included their release among their initial demands.
The building where the ground-floor British Airways office is located also houses TWA offices, and TWA's logo was prominently displayed on the facade of the building immediately above British Airways.
The blast occurred about 12:15 p.m., ripping through the office and showering glass on passers-by. A fire broke out, gutting the office and damaging a shoe store next door and three parked cars.
Officials at three hospitals that treated bomb victims said Esther Grijalba Gomez was killed in the blast. They said 27 others, including Sydney Bridges, 17, of Ontario, Calif., and Kim Aston of Devon, England, were injured.
Bridges, who was standing outside the office, told his brother Don that he saw 'some man run into the building and throw this taped box on the counter and run out again.'
'My brother said he knew what it was and he started running but it was too late,' said Don Bridges, 21, who is touring Europe with Sydney and a third brother, Fredrick, 14. They arrived in Madrid on Saturday, he said.
Minutes after the explosion, gunmen opened fire with submachine guns gn the Jordanian Alia airlines office several hundred yards away on Plaza de Espana, shattering itw windows.
Police said the assailants hurled a grenade into the offic, but it did not explode and was later deactivated by bomb disposal experts.
Madrid has been the scene of a recent wave of terrorist attacks, including the April 12 bombing of a steakhouse frequented by American servicemen from the U.S. Air Force base at Torrejon. Eighteen people died in the bombing.
On June 12, the Basque terrorist group ETA killed three people in an assassination and car bombing in Madrid.